<PAGE>
                                                                     EXHIBIT 4.1



================================================================================





                             SERIES TRUST AGREEMENT





                                     between





                       CORPORATE ASSET BACKED CORPORATION
                                  as Depositor




                                       and




                              ___________________,
                                   as Trustee






                                       and




                         ___________________, Delaware
                               as Delaware Trustee








                                  Series 200_-_



================================================================================
<PAGE>
                                                                     EXHIBIT 4.1


                             TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
<S>                                                                       <C>
A.  Creation of Trust; Trust Assets and Obligations..................       1
B.  Name of Trust....................................................       1
C.  [Delaware Trustee................................................       1]
D.  The Certificates.................................................       2
E.  Form of the Certificates.........................................       2
F.  [The Notes.......................................................       2]
G.  Underwriting Agreement...........................................       2]
H.  Allocation of Voting Rights......................................       2
I.  [Events of Default under this Series Trust Agreement.............       3]
J.  [Swap Agreement] [and] [Related Agreements]......................       3]
K.  [Credit Enhancement Agreements...................................       3]
L.  Termination of the Trust and this Series Trust Agreement.........       3
M.  Certain Definitions..............................................       3
N.  Trustee Elections................................................       4
O.  [Amendment of Certain Provisions of the Standard Terms...........       4]
</TABLE>

Exhibit A   --    Underlying Securities Schedule -- Identification of the
                  Underlying Securities

Exhibit B   --    Terms of the Certificates

Exhibit C   --    Forms of the Certificates

[Exhibit D  --    Delaware Certificate of Trust]

Schedule 1  --    [Notes and ]Certificates Standard Terms and Provisions
                  of Trust Agreement [(New York)][(Delaware)]


                                       i
<PAGE>
                                                                     EXHIBIT 4.1


                             SERIES TRUST AGREEMENT
                                       for
                            CABCO SERIES 200_-_ TRUST


            This series trust agreement (this "Series Trust Agreement"), dated
_________, 200_, between Corporate Asset Backed Corporation, as depositor (the
"Depositor"), __________________, as trustee (the "Trustee") and
__________________, Delaware, as Delaware trustee (the "Delaware Trustee") for
CABCO Series 200_-_ Trust (the "Trust"), which is issuing [$_________] in
Certificate Principal Balance of trust certificates (the "Certificates") [and
$[______] aggregate notes principal balance of Series 200_ Notes (the "Notes"
and collectively with the Certificates, or each separately, the "Securities")],
incorporates by reference the [Notes and] Certificates Standard Terms and
Provisions of Trust Agreement [(New York)][(Delaware)] attached as Schedule 1
hereto (the "Standard Terms"), and is governed by the Standard Terms as fully as
if set forth herein at length; provided, that in the event of any conflict
between (a) the provisions actually set forth in the Forepart (as defined
below), and (b) the provisions set forth in the Standard Terms and incorporated
herein by reference, the former shall control.  For purposes of the foregoing,
the "Forepart" shall mean the forepart of this Series Trust Agreement,
consisting of the provisions contained on this page and each consecutive page
thereafter to and including the signature page (page __), together with all
Exhibits hereto (which are hereby incorporated by reference and shall be part of
this Series Trust Agreement as fully as if set forth herein at length), other
than the Standard Terms.  All capitalized terms not defined herein shall have
the meanings assigned to such terms in the Standard Terms.


                              W I T N E S S E T H:
                               - - - - - - - - - -

            A. Creation of Trust; Trust Assets and Obligations. [A trust is
hereby created under the laws of the State of New York][The terms of a trust
previously created under the laws of the State of Delaware by the filing of a
Certificate of Trust with the Secretary of State of the State of Delaware on
_______, 200_ are hereby established], in the manner specified in Sections 2.1
and 2.5 of the Standard Terms, for the benefit of the registered holders of the
Certificates (the "Certificateholders"). The assets of the Trust shall consist
of (i) the securities described in Exhibit A hereto (referred to herein and in
the Standard Terms as the "Underlying Securities"), which are being sold to the
Trustee by [the Depositor] [insert other Person] simultaneously with the
execution hereof,[ and] (ii) all right, title and interest in and to
distributions on the Underlying Securities, after the date hereof[ and (iii) any
other Trust Assets specified in Exhibit A]. The Trustee shall hold the assets of
the Trust for the benefit of the holders of the Certificates, subject to the
obligations of the Trust[, and subject to the prior pledge thereof to the
Indenture Trustee (as defined below) for the benefit of holders of the Notes,
the Swap Counterparty and the parties to any Related Agreement or Credit
Enhancement Agreement, pursuant to the indenture (described below) dated as of
the date hereof (the "Indenture")]. The obligations of the Trust consist of its
obligations [under the Swap Agreement[, [insert Related Agreements]] and its
obligations] to the Trustee hereunder. [Notwithstanding the provisions in the
Standard Terms, the Trustee shall not enter into any [Swap Agreement][ or][ any
Related Agreement] with any Person.]

            B. Name of Trust. The name of the Trust is CABCO Series 200_-_
Trust.

            C. [Delaware Trustee. The Delaware Trustee is appointed to serve as
the trustee of the Trust in the State of Delaware for the sole purpose of
satisfying the requirement of Section 3807(a) of the Trust Statute that the
Trust have at least one trustee with a principal place of business in Delaware.
It is understood and agreed by the parties hereto that the Delaware Trustee
shall have none of the duties or liabilities of the Trustee. The duties of the
Delaware Trustee shall be limited to (i) accepting legal process


                                       1
<PAGE>
                                                                     EXHIBIT 4.1


served on the Trust in the State of Delaware and (ii) the execution of any
certificates required to be filed with the Delaware Secretary of State which the
Delaware Trustee is required to execute under Section 3811 of the Trust Statute.
To the extent that, at law or in equity, the Delaware Trustee has duties
(including fiduciary duties) and liabilities relating thereto to the Trust or
the Certificateholders, it is hereby understood and agreed by the other parties
hereto that such duties and liabilities are replaced by the duties and
liabilities of the Delaware Trustee expressly set forth in this Series Trust
Agreement. The Delaware Trustee shall be entitled to all of the same rights,
protections, indemnities and immunities as the Trustee under this Series Trust
Agreement. The Delaware Trustee may resign at any time by giving at least 30
days' prior notice to the Trustee and the Depositor, such resignation to become
effective upon the appointment by the Depositor of a successor Delaware
Trustee.]

            D. The Certificates. The Certificates shall be issued in __ Classes,
in the respective [principal balances][notional amounts] set forth in Exhibit B
hereto; shall have the standard terms set forth in the Standard Terms, to the
extent not in conflict with the nonstandard terms actually set forth in the
Forepart (including Exhibits A, B[,] [and] C [and D] hereto); and shall have the
nonstandard terms actually set forth in the Forepart (including Exhibits A,
B[,][ and] C[ and D] hereto). The Certificates shall be issued in substantially
the forms set forth in Exhibit C to this Series Trust Agreement, with such
necessary or appropriate changes as shall be approved by the Depositor and the
Trustee, such approval to be manifested by the execution and authentication
thereof by the Trustee. The Certificates shall evidence a Beneficial Ownership
Interest in the assets of the Trust, subject to the liabilities of the Trust,
and shall be payable solely from payments or property received by the Trustee on
or in respect of the Underlying Securities[ and the Swap Agreement and any
Related Agreement or Credit Enhancement Agreement]. [Each Certificateholder, by
its acceptance of a Certificate, shall be deemed to have acknowledged and agreed
that its rights to receive distributions in respect of the Certificate are
subordinated to the extent set forth in Sections 8.4 and 10.3 of the Indenture
to the rights of the Noteholders under the Indenture.]

            E. Form of the Certificates. The Trustee shall execute and deliver
the Certificates in the form of one or more global Certificates registered in
the name of Cede & Co. as nominee of DTC.

            F. [The Notes. The Trustee, on behalf of the Trust, shall execute
the Indenture with [insert name of the indenture trustee] (the "Indenture
Trustee"), as indenture trustee for the holders of the Notes, and shall execute
and deliver the Notes in __ Classes, in the respective principal balances,
substantially in the form of global Notes attached as Exhibit A to the Indenture
and including the standard terms set forth in therein. The Notes shall be
secured by a first priority security interest in the assets of the Trust
pursuant to the Indenture, and shall be payable solely from payments or property
received by the Trustee on or in respect of the Underlying Securities [and the
Swap Agreement and any Related Agreement or Credit Enhancement Agreement]


            G. Underwriting Agreement. The Trust is selling the Securities
directly to [UBS Securities LLC][ and ][UBS Financial Services Inc.] (the
"Underwriters"). The Trustee, on behalf of the Trust, shall execute an
underwriting agreement with the Underwriters in such form as may be approved by
the Depositor, the Trustee and the Underwriters.


            H. Allocation of Voting Rights. [The holders of the Class __, __ and
__ Certificates shall have __%, __%, and __%, respectively, of the total Voting
Rights of the Certificates. All Voting Rights with respect to the Certificates
will be allocated among all Certificateholders in proportion to the respective
principal balances of the then-Outstanding Certificates held by such
certificateholders on any date of determination.] [Specify whether and under
what circumstances voting will be class-by-class or


                                       2
<PAGE>
                                                                     EXHIBIT 4.1


as a single class.] [Specify conditions, if any, under which allocation of
Voting Rights might change from the foregoing percentages, subject to Sections
5.2 and 5.3 of the Standard Terms.]

            I. [Events of Default under this Series Trust Agreement. Any of the
following events shall be an "Event of Default" under this Series Trust
Agreement: [insert list].

            [Within [30] days after the occurrence of an Event of Default in
respect of the Certificates of any Class, the Trustee will give to the holders
of the Certificates notice, transmitted by mail, of all uncured or unwaived
Events of Default actually known to it. However, except in the case of an Event
of Default relating to the payment of principal of or premium, if any, or
interest on any of the Underlying Securities, the Trustee is protected in
withholding the notice if it determines in good faith that withholding the
notice is in the interest of the holders of the Certificates of the Class.]

            J. [Swap Agreement] [and] [Related Agreements]. [The Trustee shall,
on behalf of the Trust, execute the [Swap Agreement] [and] [the following
Related Agreements]:

                  [insert list of Related Agreements]

            K. [Credit Enhancement Agreements. The Trustee shall, on behalf of
the Trust, execute the following Credit Enhancement Agreements:

                  [insert list]

      A.    The Trustee shall on behalf of the Certificateholders present claims
            under each Credit Enhancement Agreement to which the Trust is a
            party, and shall take such reasonable steps as may be necessary to
            receive payment or to permit recovery under those instruments with
            respect to defaulted Trust Assets.]

      B.    L. Termination of the Trust and this Series Trust Agreement. The
            Trust and this Series Trust Agreement shall terminate in accordance
            with Article VIII of the Standard Terms . [The Depositor will have
            the right to purchase all remaining Underlying Securities and other
            Trust Assets in the Trust and thereby effect early retirement of the
            Certificates on any Distribution Date, [(i)] once the aggregate
            principal balance of the Underlying Securities at the time of
            purchase is not more than [specify percentage not greater than 10%]
            of the aggregate principal balance of the Underlying Securities as
            of the Closing Date [and (ii) at the option of the Depositor at
            [specify when and on what terms any option may be exercised]. In the
            event that the Depositor exercises such option, the portion of the
            purchase price allocable to the Certificates of each Class will be,
            to the extent of available funds, [100% of their then aggregate
            Outstanding Certificate Principal Balance, as applicable, plus with
            respect to the Certificates [one month's] [three months'] [specify
            other period] interest at the [Interest Rate (as specified in
            Exhibit B hereto) plus, with respect to each Class of Certificates,
            any previously accrued but unpaid interest thereon.] [Specify
            alternative allocation method if different from above.]]

            M. Certain Definitions.

                  "Business Day":  For purposes of this Series Trust
Agreement, unless otherwise indicated, any day other than a Saturday, a
Sunday or a day on which banking institutions in New York, New York,
Newark, Delaware or Wilmington, Delaware are authorized or obligated by
law or executive order to be closed.


                                       3
<PAGE>
                                                                     EXHIBIT 4.1


                  ["Required Percentage - Amendment": For purposes of this
Series Trust Agreement, [66-2/3%] of the aggregate Voting Rights of those
Certificates that are materially adversely affected by any modification or
amendment of this Series Trust Agreement.]

                  ["Required Percentage - Remedies": For purposes of this Series
Trust Agreement, 25% of the aggregate Voting Rights of the Certificates.]

                  ["Required Percentage - Waiver": For purposes of this Series
Trust Agreement, [50]% of the aggregate Voting Rights of the Certificates.]

                  "Swap Counterparty": [UBS AG, London branch].

                  "Underlying Securities Event of Default": An event of default
under the indenture or other similar document pursuant to which the Underlying
Securities were issued.

                  "Underlying Securities Acceleration": The acceleration of the
Underlying Securities after an Underlying Securities Event of Default.

                  ["Underlying Securities Acceleration Distribution
Date":  The date on which the Trustee makes an in-kind distribution of the
Underlying Securities to the Certificateholders, which shall be as soon as
practicable after the date of acceleration of the Underlying Securities,
but in no event more than five (5) Business Days after the date of
acceleration of the Underlying Securities.]

            N. Trustee Elections.

                  (1)   In the event the Internal Revenue Service
      successfully recharacterizes the Trust as a partnership for federal
      income tax purposes, the Trustee, on behalf of all of the past and
      present partners of such partnership, will, to the extent possible,
      elect out of subchapter K of the Code pursuant to Treasury
      Regulation Section 1.761-2.  Such election will, to the extent possibLe,
      be effective for the first taxable year of the Trust and
      thereafter.  Each Certificateholder is deemed to consent to such
      election.

                  (2)   The Depositor shall neither make nor direct the
      Trustee to make an election under Treasury Regulation Section 301.7701-3
      for the Trust to be classified as an association for federal tax
      purposes.

            [O. Amendment of Certain Provisions of the Standard Terms. Sections
__, __ and __ are hereby amended to read in their entirety as follows:

            [insert amended Sections as needed]

            [insert details of the Corporate Trust Office, as defined in
the Standard Terms]

            [specify, if applicable, any higher rating as contemplated in
the definition of Eligible Trust Account]

            [insert provisions, as necessary, for index-linked, foreign
currency, multi-currency Certificates and put option, if any]

            [insert provisions, as necessary, providing for status of
trust as other than grantor trust]


                                       4
<PAGE>
                                                                     EXHIBIT 4.1

            [specify the name and address for notices of the Rating Agencies]

            [specify if the Rating Agency Condition applies in the case of the
extension of the maturity of any Certificates]

            [specify if any bank account of the Trustee shall be located in a
jurisdiction other than the State of New York]

            [specify the seniority or subordination among the Classes of
Certificates]

            [if other than the Trustee, specify initial Certificate Registrar
for Section 3.3 of the Standard Terms]

            [specify if the manner for calculating the interest rate applicable
to the Certificates and the Notes]

            [insert, as needed, provisions allowing the transfer of securities
to a Benefit Plan or modifying the ERISA legend described in Section 3.13 of the
Standard Terms]

            [insert appropriate date for reports contemplated in Section 4.1(b)
of the Standard Terms]

            [specify if moneys held in the Collection Account may be reinvested,
pending application pursuant to Sections 6.2 or 8.2 of the Standard Terms],

            [insert priority waterfall as needed, modifying or amending Sections
6.2 and 8.2 of the Standard Terms]

            [insert priority of payments among the Swap Agreement, the Related
Agreements and the Credit Enhancement Agreements]

            [insert the name and address of any Person, other than the Depositor
and the Certificateholders, to receive the reports of Section 6.5]

            [specify a long-term unsecured debt rating of the Trustee or its
parent company different than the ratings of Section 7.14(a)(v)]

            [insert, as needed, modified Section 7.16 to include the obligation
of the Trustee to provide annual statement of independent public accountants,
relating to the administration of the Trust Assets during the 12-month period]

            [insert provisions describing retained interest, if any]

            [insert provision, if applicable, providing for an Underlying
Securities Acceleration Distribution Date, except upon a termination of the
Trust as set forth in Section 8.1 or 8.2 of the Standard Terms.]

            [insert provisions amending Section 7.10 of the Standard Terms, if
any, to provide for any right of the Trustee to payment from the assets of the
Trust]


                                       5
<PAGE>
                                                                     EXHIBIT 4.1


            [insert, as needed, provisions amending Section 8.1 providing for
price or manner of determination of price at which Trust Assets may be purchased
under that section, and provide that payment of the proceeds thereof shall be
applied to the Certificates on termination of the Trust]

            [insert provision for liquidation of Underlying Securities for
purposes of Section 8.2 of the Standard Terms]

            [Specify the required approval of Noteholders for the amendments
described under Section 9.2(a)]

            [insert, as needed, provisions for appointment of administrative
agent]

            [insert, as needed, provision for Depositor's exchange right]

            Section __ of the Standard Terms is hereby deleted in its entirety,
and shall not apply to CABCO Series 200_-_ Trust.]


                                       6
<PAGE>
                                                                     EXHIBIT 4.1


            IN WITNESS WHEREOF, the parties hereto have caused this Series
Trust Agreement to be executed by their respective duly authorized
officers or authorized signatories as of the date first above written.



                                       CORPORATE ASSET BACKED CORPORATION



                                       By:__________________________
                                          Authorized Signatory




                                        [TRUSTEE]




                                       By:__________________________
                                          Responsible Officer or
                                          Authorized Signatory






                                       [[TRUSTEE], DELAWARE]




                                       [By:_________________________
                                           Responsible Officer or
                                           Authorized Signatory]


Exhibit A   --    Underlying Securities Schedule -- Identification of the
                    Underlying Securities

Exhibit B   --    Terms of the Certificates

Exhibit C   --    Form of the Certificates

[Exhibit D  --    Delaware Certificate of Trust]

Schedule 1  --    [Notes and ]Certificates Standard Terms and Provisions
                  of Trust Agreement [(New York)][(Delaware)]


                                       7
<PAGE>
                                                                     EXHIBIT 4.1


                                                                       EXHIBIT A
                                                       TO SERIES TRUST AGREEMENT


                   IDENTIFICATION OF THE UNDERLYING SECURITIES


Underlying Securities Issuer:

Underlying Securities:

[Range of] Original Issue Date[s]:

Maturity Date:

[Amortization][Accumulation Schedule]:

Original Principal                            $
Amount Issued:

CUSIP No.:

[Range of][Stated] Interest Rate[s]:

[Range of] Interest Payment Dates:

Principal Amount of                           $
Underlying Securities Deposited
Under Series Trust Agreement:

Priority:

[Collateral][Unsecured Obligations]:

[Redemption/put/call/ other features]:

Exchange Listing:

Denominations; Currency:

[Underlying Securities Agreement[s]:]


                    IDENTIFICATION OF THE OTHER TRUST ASSETS


The Underlying Securities an the other Trust Assets will be held by the
Trustee as book-entry credits to an account of the Trustee or its agent at
The Depository Trust Company, New York, New York ("DTC").


                                      A-1
<PAGE>
                                                                     EXHIBIT 4.1


                                                                       EXHIBIT B
                                                       TO SERIES TRUST AGREEMENT


                            TERMS OF THE CERTIFICATES


I.    Terms of the Certificates.


<TABLE>
<S>                                              <C>
Aggregate [Principal Balance] of Certificates
   Series 200_-_:                                [$] [(notional amount)]

   Aggregate [Principal Balance]  of Class _
     Certificates                                [$][(notional amount)]

   Aggregate [Principal Balance] of Class _
     Certificates                                [$][(notional amount)]
Authorized Denomination:                         [$][1,000] and integral multiples thereof

Ratings:

Class Seniority or Subordination:

Closing Date:

Original Issue Date:

[Cut-off Date:]

Distribution Dates:

Interest Rate:                                   In respect of the Class [specify Classes] Certificates, [specify
                                                 appropriate percentages] per annum
Maturity Date / Termination Date:

Record Date:                                     [With respect to any Distribution Date, the day immediately
                                                 preceding such Distribution Date.]

Denominations; Specified Currency:

Initial Certificate Registrar:

Corporate Trust Office:


                                                 -------------
                                                 [Delaware][New York]
                                                 Attention: Corporate Trust
</TABLE>


                                      B-1
<PAGE>
                                                                     EXHIBIT 4.1


                                                                       EXHIBIT C
                                                       TO SERIES TRUST AGREEMENT


                              [FORM OF CERTIFICATE]

                     CABCO TRUST CERTIFICATES, SERIES 200_-_

                                     [FACE]

NO EMPLOYEE BENEFIT PLAN (AS DEFINED IN SECTION 3(3) OF ERISA) WHICH IS
SUBJECT TO ERISA, NO PLAN (AS DEFINED IN SECTION 4975(e)(1) OF THE CODE,
OTHER THAN A GOVERNMENTAL OR CHURCH PLAN DESCRIBED IN SECTION 4975(g)(2)
OR (3) OF THE CODE) WHICH IS SUBJECT TO SECTION 4975 OF THE CODE, NO
GOVERNMENTAL OR CHURCH PLAN THAT IS SUBJECT TO ANY FEDERAL, STATE OR LOCAL
LAW THAT IS, TO A MATERIAL EXTENT, SIMILAR TO THE PROHIBITED TRANSACTION
PROVISIONS OF ERISA OR SECTION 4975 OF THE CODE, AND NO ENTITY WHOSE
UNDERLYING ASSETS INCLUDE "PLAN ASSETS" BY REASON OF ANY SUCH PLAN'S
INVESTMENT IN THE ENTITY (EXCLUDING ANY ENTITY REGISTERED UNDER THE
INVESTMENT COMPANY ACT OF 1940, AS AMENDED) (EACH, A "PLAN"), OR ANY
PERSON ACTING ON BEHALF OF ANY PLAN, MAY PURCHASE OR HOLD A CERTIFICATE OR
ANY INTEREST THEREIN.

THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE SERIES
TRUST AGREEMENT HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF
THE DEPOSITORY TRUST COMPANY ("DTC") OR A NOMINEE OF DTC.  THIS
CERTIFICATE IS EXCHANGEABLE FOR CERTIFICATES REGISTERED IN THE NAME OF A
PERSON OTHER THAN DTC OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES
DESCRIBED IN THE SERIES TRUST AGREEMENT AND MAY NOT BE TRANSFERRED EXCEPT
AS A WHOLE BY DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
DTC TO THE TRUST OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR
PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE &
CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE
OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS
IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER,
PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS
WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN
INTEREST HEREIN.

This Certificate does not represent an interest in or obligation of the
Depositor, the Trustee or any of their Affiliates, except to the extent
described herein.


                                      C-1
<PAGE>
                                                                     EXHIBIT 4.1


CERTIFICATE NUMBER ___                                           [$]__________
CUSIP No.: ____________                               Initial Principal Amount

                     CABCO TRUST CERTIFICATE, SERIES 200_-_

                        [ %] [FLOATING] PASS-THROUGH RATE

evidencing a beneficial ownership interest in the Trust, as defined below,
the assets of which include principally $[__] aggregate principal amount
of __________________________ (the "Underlying Securities") and[, subject
to the prior right of the holders of the notes (the "Notes") issued by the
Trust, pursuant to an Indenture dated____, 200_ (the "Indenture") between
the Trust and ___, as indenture trustee (the "Indenture Trustee")] all
payments received thereon.

      THIS CERTIFIES THAT _____________________is the registered owner of
a nonassessable, fully-paid, beneficial ownership interest in CABCO Series
200_-_ Trust (the "Trust") formed by Corporate Asset Backed Corporation,
as depositor (the "Depositor").


      The Trust was created pursuant to a Series Trust Agreement, dated as
of ________, 200_, into which Standard Terms and Provisions of Trust
Agreement have been incorporated by reference (as amended and supplemented
from time to time, the "Series Trust Agreement"), between the Depositor,
__________________, as trustee (the "Trustee") and __________________,
Delaware, as Delaware trustee.  A summary of certain of the pertinent
provisions of the Series Trust Agreement is set forth below.  To the
extent not otherwise defined herein, the capitalized terms used herein
have the meanings assigned to them in the Series Trust Agreement.


      This Certificate is issued under and is subject to the terms,
provisions and conditions of the Series Trust Agreement, to which Series
Trust Agreement the Certificateholder by virtue of the acceptance hereof
assents and by which such Certificateholder is bound.  The assets of the
Trust include the Underlying Securities and all proceeds of the Underlying
Securities.  Capitalized terms used but not defined herein have the
meanings specified in the Series Trust Agreement.  [The Trust Assets are
pledged on a to the Indenture Trustee on behalf of the holders of the
Notes.]

      Subject to the terms and conditions of the Series Trust Agreement,
(including the availability of funds for distributions and any applicable
grace period or cure period) and to the prior obligation of the Trust to
pay all unpaid fees and expenses owed to any of the Trustee or its agents,
up to the allowable expense amounts for the related collection period, and
all other obligations of the Trust [including the Notes], there shall be
distributed on the dates specified in the Series Trust Agreement (the
"Distribution Dates"), to the Person in whose name this Certificate is
registered at the close of business on the Record Date specified in the
Series Trust Agreement, such Certificateholder's beneficial ownership
interest in the amount of distributions in respect of the Certificate
Principal Balance to be distributed to Certificateholders on the
Distribution Date.

      The distributions in respect of this Certificate are payable in such
[coin or currency of the United States of America][other specified
currency, as set forth in the Series Trust Agreement] as at the time of
payment is legal tender for payment of public and private debts.

      [By acceptance of this Certificate, the holder hereof acknowledges
and agrees that the rights to distributions hereunder are subordinate to
the rights of holders of the Notes as described in the Indenture.
Notwithstanding anything to the contrary in the Series Trust Agreement, no
distributions shall be made to the holder of this Certificate on any date
until the holders of the Notes have received all payments of


                                      C-2
<PAGE>
                                                                     EXHIBIT 4.1


interest and principal due and owing to them as of such date. In the event that
any payment or distribution of assets of the Trust is received by the holder of
this Certificate contrary to the preceding sentence, such payment or
distribution shall be held in trust for the benefit of and shall be paid
immediately over to the Indenture Trustee for payment of any interest and
principal due and owing to the holders of the Notes as of such date remaining
unpaid after giving effect to any concurrent payment or distribution to the
holders of the Notes.]

      It is the intent of the Depositor and the Certificateholders that
the Trust will be classified as a [grantor trust under subpart E, Part I
of subchapter J of the][partnership] [specify other form] for purposes of
the Internal Revenue Code of 1986.  Except as otherwise required by
appropriate taxing authorities, the Depositor and the Trustee, by
executing the Series Trust Agreement, and each Certificateholder, by
acceptance of a Certificate, agrees to treat, and to take no action
inconsistent with the treatment of, the Certificate for such tax purposes
as interests in a [grantor trust][ partnership][ other], and the
provisions of the Series Trust Agreement shall be interpreted to further
this intention of the parties.

      Distributions on this Certificate shall be made as provided in the
Series Trust Agreement by the Trustee by wire transfer or check mailed to
the Certificateholder of record in the Certificate Register without the
presentation or surrender of this Certificate or the making of any
notation hereon.  Except as otherwise provided in the Series Trust
Agreement and notwithstanding the above, the final distribution on this
Certificate shall be made after due notice by the Trustee of the pendency
of such distribution and only upon presentation and surrender of this
Certificate at the office maintained for such purpose by the Trustee in
the Borough of Manhattan, the City of New York.

      This Certificate does not represent an obligation of, or an interest
in, the Depositor, the Trustee or any Affiliates of any of them and no
recourse may be had against such parties or their assets, except as may be
expressly set forth or contemplated herein or in the Basic Documents.  In
addition, this Certificate is not guaranteed by any governmental agency or
instrumentality and is limited in right of payment to certain collections
with respect to the Trust Assets, all as more specifically set forth
herein and in the Series Trust Agreement.

      This Certificate does not purport to summarize the Series Trust
Agreement and reference is hereby made to the Series Trust Agreement for
information with respect to the rights, benefits, obligations and duties
evidenced thereby.  A copy of the Series Trust Agreement may be examined
during normal business hours at the Corporate Trust Office of the Trustee,
located at ____________________________, __________ and at such other
places, if any, designated by the Trustee, by any Certificateholder upon
request.

      Reference is hereby made to the further terms of this Certificate
set forth on the reverse hereof, which further terms shall for all
purposes have the same effect as if set forth at this place.

      [This Certificate shall be shall be construed in accordance with the
laws of the State of New York, without reference to any conflict of law
provision that would require the application of the substantive law of
another state, other than Section 5-1401 of the General Obligations Law,
and the obligations, rights and remedies of the parties hereunder shall be
determined in accordance with such laws.]  [This Certificate shall be
construed in accordance with the laws of the State of Delaware, without
reference to any conflict of law provision that would require the
application of the substantive law of another state, and the obligations,
rights and remedies of the parties hereunder shall be determined in
accordance with such laws, except that the provisions of the Series Trust
Agreement with respect to the


                                      C-3
<PAGE>
                                                                     EXHIBIT 4.1


transfer of the Trust Assets to the Trust by the Depositor shall be construed in
accordance with the Laws of the State of New York.]

      Unless the certificate of authentication hereon shall have been
executed by an authorized officer or Authorized Signatory of the Trustee
by manual signature, this Certificate shall not entitle the
Certificateholder hereof to any benefit under the Series Trust Agreement
or be valid for any purpose.


                                      C-4
<PAGE>
                                                                     EXHIBIT 4.1



      IN WITNESS WHEREOF, the Trustee, on behalf of the Trust, has caused
this Certificate to be duly executed by its manual signature as of the
date set forth below.

                                       CABCO SERIES 200_-_ TRUST




                                 By:   __________________,
                                       not in its individual capacity but
                                       solely as Trustee




                                       By:
                                          -----------------------------------
                                                Authorized Officer or
                                                Authorized Signatory
                                                Name:
                                                Title:


      Dated:
             -----------------

      This is one of the Certificates referred to in the within-mentioned
Series Trust Agreement.




                                 By:   __________________,
                                       not in its individual capacity but
                                       solely as Authenticating Agent




                                       By:
                                          -----------------------------------
                                                Responsible Officer or
                                                Authorized Signatory of
                                                Trustee
                                                Name:
                                                Title:

      Dated:
             -----------------

                                      C-5
<PAGE>
                                                                     EXHIBIT 4.1


                     [FORM OF REVERSE OF TRUST CERTIFICATE]

      The Series Trust Agreement permits the amendment thereof, in certain
circumstances, without the consent of the Certificateholders.

      As provided in the Series Trust Agreement and subject to certain
limitations therein set forth, the transfer of this Certificate is
registerable in the Certificate Register upon surrender of this
Certificate for registration of transfer at the offices or agencies of the
Certificate Registrar maintained by the Trustee in The Borough of
Manhattan, The City of  New York, accompanied by a written instrument of
transfer in form satisfactory to the Trustee and the Certificate Registrar
duly executed by the Certificateholder hereof or such Certificateholder's
attorney duly authorized in writing, and thereupon one or more new
Certificates in authorized denominations of the same Class and a like
aggregate Certificate Principal Balance will be issued to the designated
transferee.  The initial Certificate Registrar appointed under the Series
Trust Agreement is the Trustee.

      This Certificate is issuable only in registered form in the
authorized denominations specified in the Series Trust Agreement.  As
provided in the Series Trust Agreement and subject to certain limitations
therein set forth, at the option of a Certificateholder, Certificates are
exchangeable for new Certificates of authorized denominations of the same
Class and a like aggregate Certificate Principal Balance as requested by
the Certificateholder surrendering the same; provided, however, that no
Certificate may be subdivided such that the denomination of any resulting
Certificate is other than the authorized denominations specified in the
Series Trust Agreement.

      No service charge shall be made for any registration of transfer or
exchange, but the Trustee or the Certificate Registrar may require payment
of a sum sufficient to cover any tax or governmental charge payable in
connection therewith.

      The Depositor, Trustee, Certificate Registrar and any agent of the
Depositor, Trustee or the Certificate Registrar may treat the person in
whose name this Certificate is registered as the owner hereof for all
purposes, and none of the Depositor, Trustee, Certificate Registrar or any
such agent shall be affected by any notice to the contrary.

      The obligations and responsibilities created by the Series Trust
Agreement shall terminate and the Trust created thereby shall dissolve,
wind-up and terminate [in accordance with Section 3808 of the Delaware
Statutory Trusts Act] and be of no further force or effect 60 days after
the earlier of the (a) final distribution by the Trustee of all moneys or
other property or proceeds of the Trust Assets in accordance with the
terms of the Series Trust Agreement and (b) the distribution by the
Trustee in accordance with the terms of the Series Trust Agreement of the
proceeds of the purchase of all the Trust Assets by the party entitled to
do so.

      Neither the Depositor nor any Certificateholder shall be entitled to
revoke or terminate the Trust.


                                      C-6
<PAGE>
                                                                     EXHIBIT 4.1


                                   Schedule 1

[Schedule 1, not repeated here, shall be identical to Exhibits A and B
attached to the Series Trust Agreement]


                                      C-7
<PAGE>
                                                                     EXHIBIT 4.1


                                   ASSIGNMENT

            FOR VALUE RECEIVED the undersigned hereby sells, assigns and
transfers unto

PLEASE INSERT SOCIAL SECURITY
OR OTHER IDENTIFYING NUMBER
OF ASSIGNEE

_______________________________________________________________________________
(Please print or typewrite name and address, including postal zip code, of
assignee)

_______________________________________________________________________________
the within Certificate, and all rights thereunder, hereby irrevocably
constituting and appointing

_______________________________________________________________________________
Attorney to transfer said Certificate on the books of the Certificate
Registrar, with full power of substitution in the premises.

Dated:

                           */
         ------------------

                                    Signature Guaranteed:

                           */
         ------------------

-------------

            */ NOTICE: The signature to this assignment must correspond
with the name as it appears upon the face of the within Certificate in
every particular, without alteration, enlargement or any change whatever.
Such signature must be guaranteed by a member of the New York Stock
Exchange or a commercial bank or trust company.


                                      C-8
<PAGE>
                                                                       EXHIBIT D
                                                       TO SERIES TRUST AGREEMENT


                          DELAWARE CERTIFICATE OF TRUST

                            CABCO Series 200_-_ Trust


      This Certificate of Trust of CABCO Series 200_-_ Trust (the "Trust"), is
being duly executed and filed by _______________________, Delaware, a Delaware
banking corporation, not in its individual capacity but solely as trustee (the
"Trustee") to form a statutory trust under Chapter 38 of Title 12 of the
Delaware Code (12 Del. C. Sections 3801 Et seq.).


      1.    Name.  The name of the Trust is CABCO Series 200_-_ Trust.

      2.    Trustee.  The name and business address of the trustee of the
            Trust is:


            __________________, Delaware


            -----------------------
            Wilmington, Delaware 19801

      IN WITNESS WHEREOF, the authorized officer or authorized signatory
of the undersigned banking corporation has set his hand to this instrument
as of this ___ day of _____200_.


      By: __________________, Delaware,
          not in its individual capacity but solely as Trustee of CABCO
          Series 200_-_ Trust


          By:
              -------------------------
              Authorized Officer or
              Authorized Signatory
              Name:
              Title:


                                      D-1