Document:

<PAGE>

                                                            Exhibit 10.6.1

                         REAFFIRMATION AGREEMENT, dated as of June 12, 2002 (as
                    the same may from time to time be amended, supplemented or
                    otherwise modified, this "Agreement"), among KANSAS CITY
                    SOUTHERN, a Delaware corporation ("Holdings"), THE KANSAS
                    CITY SOUTHERN RAILWAY COMPANY, a Missouri Corporation ("the
                    Borrower") and JPMORGAN CHASE BANK (formerly known as The
                    Chase Manhattan Bank), as Administrative Agent (in such
                    capacity, "JPMorgan Chase") under the Credit Agreement
                    referred to below.

     WHEREAS Holdings, the Borrower, the Lenders party thereto, and JPMorgan
Chase have entered into the Amendment and Restatement Agreement (the "Amendment
Agreement"), dated as of June 12, 2002, which provides for the amendment and
restatement of the Credit Agreement dated as of January 11, 2000 (as amended
after giving effect to the Amendment Agreement, the "Credit Agreement") among
Holdings, the Borrower, the Lenders from time to time party thereto and JPMorgan
Chase;

     WHEREAS each of the parties signatory hereto (each a "Reaffirming Party")
is party to one or more of the Security Documents (such term and each other
capitalized term used but not defined herein having the meaning assigned in the
Credit Agreement), and each of the Subsidiary Loan Parties is party to the
Guaranty Agreement and the Indemnity Subrogation and Contribution Agreement (the
Security Documents, the Guaranty Agreement and the Indemnity Subrogation and
Contribution Agreement herein together referred to as the "Collateral
Documents").

     WHEREAS each Reaffirming Party expects to realize, or has realized,
substantial direct and indirect benefits as a result of the Amendment Agreement
becoming effective and the consummation of the transactions contemplated
thereby; and

     WHEREAS the execution and delivery of this Agreement is a condition
precedent to the effectiveness of the Amendment Agreement and the consummation
of the transactions contemplated thereby;

     NOW, THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

<PAGE>

                                    ARTICLE I

                     Reaffirmation/Amendment and Restatement

     SECTION 1.01. Reaffirmation. Each of the Reaffirming Parties hereby
consents to the Amendment Agreement and the transactions contemplated thereby
and hereby confirms its respective guarantees, pledges and grants of security
interests, as applicable, under each of the Collateral Documents to which it is
party, and agrees that notwithstanding the effectiveness of the Amendment
Agreement and the consummation of the transactions contemplated thereby such
guarantees, pledges and grants of security interests shall continue to be in
full force and effect and shall accrue to the benefit of the Secured Parties (as
defined in the Credit Agreement). Each of the Reaffirming Parties further agrees
to take any action that may be required or that is reasonably requested by the
Administrative Agent to ensure compliance by the Borrower with Sections 5.12 and
5.13 of the Credit Agreement and hereby reaffirms its obligations under each
similar provision of each Collateral Document to which it is party.

     SECTION 1.02. Amendment and Restatement. On and after the effectiveness of
the Amendment Agreement, (i) each reference in each Collateral Document to the
"Credit Agreement", "thereunder", "thereof" or words of like import shall mean
and be a reference to the Credit Agreement as may be amended, modified or
supplemented and in effect from time to time, (ii) the definition of any term
defined in any Collateral Document by reference to the terms defined in the
Credit Agreement shall be amended to be defined by reference to the defined term
in the Credit Agreement, as amended, modified or supplemented and in effect from
time to time and (iii) Schedule I to the Pledge Agreement is hereby amended as
set forth on Schedule I hereto.

                                   ARTICLE II

                         Representations and Warranties

     Each Reaffirming Party hereby represents and warrants, which
representations and warranties shall survive execution and delivery of this
Agreement, as follows:

     SECTION 2.01. Organization. Such Reaffirming Party is duly organized and
validly existing in good standing under the laws of the jurisdiction of its
formation.

     SECTION 2.02. Authority, Enforceability. Such Reaffirming Party has the
power and authority to execute, deliver and carry out the terms and provisions
of this Agreement and has taken all necessary action to authorize the execution,
delivery and performance by it of this Agreement. Such Reaffirming Party has
duly executed and delivered this Agreement, and this Agreement constitutes its
legal, valid and binding obligation, enforceable against it in accordance with
its terms.

     SECTION 2.03. Loan Documents. The representations and warranties of such
Reaffirming Party contained in each Loan Document are true and correct in all
material respects on and as of the date hereof with the same effect as though
made on and as of such date, except to the extent such representations and
warranties expressly relate to an earlier date (in which case such
representations and warranties shall have been true and correct in all material

<PAGE>

respects as of such earlier date).

                                   ARTICLE III

                                  Miscellaneous

     SECTION 3.01. Notices. All notices and other communications hereunder shall
be made at the addresses, in the manner and with the effect provided in Article
IX of the Credit Agreement; provided that, for this purpose, the address of each
Reaffirming Party shall be the one specified for Holdings or the Borrower under
the Credit Agreement.

     SECTION 3.02. Expenses. Each Reaffirming Party agrees to pay all reasonable
costs, fees and expenses (including reasonable attorneys' fees and time charges
of attorneys for JPMorgan Chase or any Lender, which attorneys may be employees
of JPMorgan Chase or any Lender) incurred by JPMorgan Chase or any Lender in
enforcing any Reaffirming Party's obligations under this Agreement.

     SECTION 3.03. Loan Document. This Agreement is a Loan Document executed
pursuant to the Credit Agreement and shall (unless otherwise expressly indicated
herein) be construed, administered and applied in accordance with the terms and
provisions thereof.

     SECTION 3.04. Section Captions. Section captions used in this Agreement are
for convenience of reference only and shall not affect the construction of this
Agreement.

     SECTION 3.05. Severability. Wherever possible each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement shall be prohibited by or
invalid under such law, such provision shall be ineffective to the extent of
such prohibition or invalidity, without invalidating the remainder of such
provision or the remaining provisions of this Agreement.

     SECTION 3.06. Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the parties hereto and their respective
successors and assigns.

     SECTION 3.07. Amendment.  This Agreement may be waived, modified or amended
only by a written agreement executed by each of the parties hereto.

     SECTION 3.08. Counterparts. This Agreement may be executed in any number of
counterparts and by the different parties hereto on separate counterparts, each
of which when so executed and delivered shall be an original but all of which
shall together constitute one and the same agreement. Delivery of an executed
counterpart of a signature page of this Agreement by facsimile transmission
shall be effective as delivery of a manually executed counterpart of this
Agreement.

     SECTION 3.09. No Novation. Neither this Agreement nor the execution,
delivery or effectiveness of the Amendment Agreement shall extinguish the
obligations for the payment of money outstanding under the Amendment Agreement
or the Credit Agreement or discharge or release the Lien or priority of any
Security Document or any other security therefor. Nothing herein contained shall
be construed as a substitution or novation of the obligations outstanding under
the Amendment Agreement or the Credit Agreement or instruments securing the
same, which shall remain in full force and effect, except to any extent modified
hereby or by instruments executed concurrently herewith. Nothing implied in this
Agreement, the Amendment Agreement or in any other document contemplated hereby
or thereby shall be construed as a release or other discharge of any Borrower or
any Guarantor or any Pledgor or any Grantor under any Collateral Document from
any of its obligations and liabilities as a "Borrower", "Subsidiary Guarantor",
"Subsidiary Loan Party", "Subsidiary Pledgor", "Subsidiary Grantor",
"Guarantor", "Loan Party", "Pledgor" or "Grantor" under the Credit Agreement or
the Collateral Documents. Each of the Credit Agreement and the Collateral
Documents shall remain in full force and effect, until (as applicable) and
except to any extent modified hereby or by the Amendment Agreement or in
connection herewith and therewith.

<PAGE>

     IN WITNESS WHEREOF, each Reaffirming Party and JPMorgan Chase as
Administrative Agent for the benefit of the Lenders caused this Agreement to be
duly executed and delivered as of the date first above written.

                                           KANSAS CITY SOUTHERN,

                                           by /s/ Paul J. Weyandt
                                             -----------------------------------
                                             Name: Paul J. Weyandt
                                             Title: Vice President & Treasurer

                                           THE KANSAS CITY SOUTHERN
                                           RAILWAY COMPANY,

                                           by /s/ Paul J. Weyandt
                                             -----------------------------------
                                             Name: Paul J. Weyandt
                                             Title: Vice President & Treasurer

                                           THE KANSAS CITY NORTHERN
                                           RAILWAY COMPANY,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & CFO

                                           CAYMEX TRANSPORTATION, INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

<PAGE>

                                           GATEWAY EASTERN RAILWAY
                                           COMPANY,

                                           by /s/ Paul J. Weyandt
                                             -----------------------------------
                                             Name: Paul J. Weyandt
                                             Title: Vice President & Treasurer

                                           SCC HOLDINGS, INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Authorized Representative

                                           MID-SOUTH MICROWAVE, INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

                                           PABTEX, L.P.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Authorized Representative

                                           PABTEX GP, LLC,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Authorized Representative

<PAGE>

                                           RICE-CARDEN CORPORATION,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

                                           SIS BULK HOLDINGS, INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

                                           SOUTHERN DEVELOPMENT
                                           COMPANY,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

                                           SOUTHERN INDUSTRIAL SERVICES,
                                           INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

                                           TRANS-SERVE, INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

<PAGE>

                                           VEALS, INC.,

                                           by /s/ Robert H. Berry
                                             -----------------------------------
                                             Name: Robert H. Berry
                                             Title: Vice President & Treasurer

                                           JPMORGAN CHASE BANK, as
                                           Administrative Agent,

                                           by /s/ Julie S. Long
                                             -----------------------------------
                                             Name: Julie S. Long
                                             Title: Vice President

<PAGE>

                                           Schedule I to Reaffirmation Agreement
EQUITY INTERESTS

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

<TABLE>
<CAPTION>
                                                                                                                   Ownership Percent
                                                       Registered Owner       Class                     Number      Represented by
Name of Entity Whose Entity Interests are being      of Equity Interests    of Equity                 of Equity    Equity Interests
Pledged (and jurisdiction of organization)              being pledged       Interests      Cert No.   Interests      Being Pledged
-----------------------------------------------      -------------------    ----------     --------   ---------    -----------------
<S>                                                  <C>                    <C>            <C>        <C>          <C>
Caymex Transportation, Inc. (Cayman Islands,
domesticated in Delaware)                               KCSR                 Common           4          100              100%

Gateway Eastern Railway Company (Illinois)              KCSR                 Common           1         1,000             100%

The Kansas City Northern Railway Company (Delaware)     KCSR                 Common           3           10              100%

The Kansas City Southern Railway Company (Missouri)     KCS                  Preferred      KP 445        57              100%

The Kansas City Southern Railway Company (Con't)        KCS                  Common         KC 418    9,840,000           100%

Mid-South Microwave, Inc. (Delaware)                    KCSR                 Common           5         1,000             100%

PABTEX, L.P. (formerly known as Global Terminaling      PABTEX GP, LLC       Partnership      1           1                1%
Services, Inc.) (Delaware)                                                   Interests
                                                        SIS Bulk Holding,                     2           99              99%
                                                        Inc.

PABTEX GP, LLC (Texas)                                  SIS                  Membership       1          100              100%
                                                                             Interests

Rice-Carden Corporation (Missouri)                      KCSR                 Common           31        1,000             100%

SCC Holdings, LLC (Delaware)                            KCSR                 Membership      ---         ---              100%
                                                                             Interests

SIS Bulk Holding, Inc. (Delaware)                       SIS                  Common           1         1,000             100%

Southern Development Company (Missouri)                 KCSR                 Common           19         100              100%

Southern Industrial Services, Inc. (Delaware)           KCS                  Common           4          110              100%

Trans-Serve, Inc. (Delaware)                            SIS                  Common           A5        1,000             100%

Veals, Inc. (Delaware)                                  KCS                  Common           8          100              100%
</TABLE><PAGE>

                                                                   Exhbit 10.6.2

                                                                  EXECUTION COPY

                        MASTER ASSIGNMENT AND ACCEPTANCE

     Reference is made to (A) the Credit Agreement dated as of January 11, 2000,
(the "Original Credit Agreement"), among Kansas City Southern ("Holdings"), The
Kansas City Southern Railway Company (the "Borrower"), the Lenders from time to
time party thereto and JPMorgan Chase Bank, as Administrative Agent, Collateral
Agent, Issuing Bank and Swingline Lender, (B) the Original Credit Agreement as
amended and restated as of the June 12, 2002, among Kansas City Southern, The
Kansas City Southern Railway Company, the Lenders from time to time party
thereto and JPMorgan Chase Bank (the "Restated Credit Agreement") and (C) the
Amendment and Restatement Agreement (the "Amendment Agreement") dated as of June
12, 2002, among Holdings, the Borrower, the Lenders party thereto and the
Administrative Agent. Capitalized terms used and not otherwise defined herein
have the meanings assigned to them in the Original Credit Agreement and the
Restated Credit Agreement.

     All Lenders executing this Master Assignment and Acceptance that hold
Tranche B Term Loans under the Original Credit Agreement, and all financial
institutions that will hold Tranche B Term Loans under the Restated Credit
Agreement, agree as follows:

     SECTION 1. "Interest" means all interests in a Party's rights and
obligations under the Restated Credit Agreement with respect to the Tranche B
credit facilities contained therein, including, without limitation, the Term
Loans that are outstanding on the Master Assignment Date.

     "New Lender" means any Party that shall not have been a Lender holding
Tranche B Term Loans under the Original Credit Agreement.

     "Party" means any party to this Master Assignment and Acceptance other than
Holdings or the Borrower.

     SECTION 2. Effective as of the Master Assignment Date set forth below, and
after giving effect to the prepayments required under Section 3 of the Amendment
Agreement, each Party hereby purchases and assumes and/or sells and assigns its
rights and obligations under the Restated Credit Agreement such that such Party
will hold an Interest, after giving effect to the transactions provided for in
this Master Assignment and Acceptance, in the amount specified on such Party's
signature page to this Master Assignment and Acceptance. To the extent that a
Party's Interest is greater following the execution of this Master Assignment
and Acceptance than it was prior to the execution of this Master Assignment and
Acceptance (an "Increasing Lender"), such Increasing Lender will be deemed to

<PAGE>

have purchased and assumed the increase in such Lender's Interest from all
Parties whose Interests have decreased as a result of the transactions provided
for in this Master Assignment and Acceptance ("Decreasing Lenders") ratably in
accordance with the Interests transferred by such Decreasing Lenders. Each
Decreasing Lender shall be deemed to have sold and assigned an amount equal to
the decrease in its Interest to the Increasing Lenders ratably in accordance
with the Interests acquired by such Increasing Lenders. Each Party represents
and warrants that it is the legal and beneficial owner of any interests being
assigned by it hereunder and that such interests are free and clear of any
Liens. Each New Lender hereby acknowledges receipt of a copy of the Restated
Credit Agreement. From and after the Master Assignment Date (i) each New Lender
shall be a party to and be bound by the provisions of the Restated Credit
Agreement and, to the extent of the interests held by it after giving effect to
the transactions provided for in this Master Assignment and Acceptance, have the
rights and obligations of a Lender thereunder and (ii) each Party shall, to the
extent of the interests assigned by it pursuant to this Master Assignment and
Acceptance, relinquish its rights and be released from its obligations under the
Restated Credit Agreement.

     SECTION 3. On the Master Assignment Date, subject to the terms and
conditions set forth herein, (i) each Increasing Lender purchasing and assuming
Interests pursuant to Section 2 above shall pay an amount equal to the
difference between such Lender's Interest after giving effect to the
transactions provided for in this Master Assignment and Acceptance and such
Lender's Interest prior to such transactions by wire transfer of immediately
available funds to the Administrative Agent not later than 12:00 Noon (New York
City time) and (ii) the Administrative Agent shall promptly pay to each
Decreasing Lender selling and assigning Interests pursuant to Section 2 above,
out of the amounts received by the Administrative Agent pursuant to clause (i)
of this Section, an amount equal to the difference between such Lender's
Interest before giving effect to the transactions provided for in this Master
Assignment and Acceptance and such Lender's Interest after giving effect to such
transactions by wire transfer of immediately available funds to the account
designated by such Decreasing Lender to the Administrative Agent; provided,
however that the execution, delivery or effectiveness of this Master Assignment
and Acceptance shall not affect the Borrower's obligations accrued in respect of
any principal, interest, fees or other amounts under the Original Credit
Agreement or discharge or release the Lien or priority of any pledge agreement
or any other security therefor.

     SECTION 4. (a) This Master Assignment and Acceptance is being delivered to
the Administrative Agent together with (i) to the extent required for each New
Lender, any documentation required to be delivered by such New Lender pursuant
to Section 2.17(e) of the Original Credit Agreement, and (ii) for each New
Lender, an Administrative Questionnaire in the form provided by the
Administrative Agent.

     (b) All New Lenders will be deemed to have agreed and become party to the
Amendment Agreement.

     SECTION 5. This Master Assignment and Acceptance shall be governed by and
construed in accordance with the laws of the State of New York.

Date of Assignment:  June 12, 2002

Effective Date, of Assignment ("Master Assignment Date"):  June 12, 2002

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Master Assignment
and Acceptance to be executed as of the date first above written by their
respective duly authorized officers.

                                   KANSAS CITY SOUTHERN

                                      by   /s/ Robert H. Berry
                                         ---------------------------------------
                                           Name:  Robert H. Berry
                                           Title:  Senior Vice President & CFO

                                   THE KANSAS CITY SOUTHERN
                                   RAILWAY COMPANY

                                      by   /s/ Robert H. Berry
                                         ---------------------------------------
                                           Name:  Robert H. Berry
                                           Title:  Senior Vice President & CFO

                                   JPMORGAN CHASE BANK, as
                                   Administrative Agent, Collateral Agent,
                                   Issuing Bank, Swingline Lender and
                                   Assignor,

                                      by   /s/ Julie S. Long
                                        ----------------------------------------
                                           Name:  Julie S. Long
                                           Title:  Vice President

<PAGE>

Signature Page to Kansas City Southern
Master Assignment and Acceptance
dated as of June 12, 2002

[_]  New or Ongoing Lender*
Principal amount of assumed and assigned Interest after giving effect to all
assignments under this Master Assignment and Acceptance: $_____________________

[_]  Departing Lender**
Principal amount of assumed and assigned Interest after giving effect to all
assignments under this Master Assignment and Acceptance: $0.00.

Name of Institution:

___________________________________

    by ___________________________________
         Name:
         Title:

____________________________________

*  All new and ongoing Tranche B Lenders should check the top box, fill in the
   amounts of their allocations and sign this page.

** Departing Tranche B Lenders should check the lower box and sign this page.

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