Document:

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                                                                    EXHIBIT 10.8

                                 Promissory Note

         FOR VALUE RECEIVED, the undersigned promises to pay to the order of
Sybron Dental Specialties, Inc. the sum of ($400,000.00).

         Said sum shall be paid in three installments. The first installment
shall be in the amount of one hundred thousand dollars ($100,000.00) and shall
be paid on or about September 1, 2001. The second installment shall be in the
amount of one hundred thousand dollars ($100,000.00) and shall be paid on or
about September 1, 2002. The third installment shall be in the amount of two
hundred thousand dollars ($200,000.00) and shall be paid on or about September
1, 2003.

         No interest shall accrue or be due on any amount owed unless and until
an amount is past due in which event interest shall accrue and be due on the
past due amount at the rate of ten percent (10%) per annum until paid.

         This note shall be fully payable upon demand of any holder in the event
the undersigned shall default in making any payments due under this note within
thirty (30) days of its due date.

         In the event of any default, the undersigned agrees to pay all
reasonable attorney fees and costs of collection to the extent permitted by law.
This note shall take effect as a sealed instrument and be enforced in accordance
with the laws of the payee's state.

Dated: September 1, 2000

                                                          /s/ Stephen J. Tomassi
                                                          ----------------------<PAGE>

                                                                     EXHIBIT 4.4

     THIS SECOND SUPPLEMENTAL INDENTURE, dated as of August 31, 2000, among
PACER INTERNATIONAL, INC., a Tennessee corporation (the "Company"), GTS
TRANSPORTATION SERVICES, INC., a California corporation ("GTS"), and Wilmington
Trust Company, as trustee (the "Trustee"), under the Indenture (referred to
hereinafter) pursuant to which the Company issued its 11 3/4% Senior
Subordinated Notes due 2007 (the "Securities").

                                  WITNESSETH:

     WHEREAS, the Company, the Guarantors named therein, and the Trustee
executed and delivered a certain Indenture dated as of May 28, 1999 (the
"Indenture"), providing for the issuance of up to an aggregate principal amount
of $150,000,000 of the Securities;

     WHEREAS, the Company by appropriate action has determined that it is
desirable to amend certain provisions of the Indenture; and

     WHEREAS, pursuant to a Stock Purchase Agreement dated August 31, 2000, the
Company is acquiring all of the issued and outstanding capital stock of GTS; and

     WHEREAS, Section 4.18 of the indenture provides that under certain
circumstances the Company is required to cause Domestic Restricted Subsidiaries
which are not Guarantors to execute and deliver to the Trustee a supplemental
indenture and Guarantee (as defined in the Indenture) pursuant to which such
Domestic Restricted Subsidiaries shall unconditionally guarantee all of the
Company's obligations under the Securities and the Indenture on the terms set
forth in the Indenture; and

     NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, GTS, the
Company and the Trustee mutually covenant and agree for the equal and ratable
benefit of the holders of the Securities as set forth below.

                                   Article I

                                   Amendment

     1.1 GTS hereby, jointly and severally with all other Guarantors,
unconditionally and irrevocably guarantees, on a senior subordinated basis, the
Company's obligations under the indenture and the Securities on the terms and
subject to the conditions set forth in Article Eleven of the Indenture.

     1.2 Except as expressly amended hereby, the Indenture is in all respects
ratified and confirmed and all the terms, conditions and provisions thereof
shall remain in full force and effect. This Second Supplemental Indenture shall
form a part of the Indenture for all Purposes, and every holder of Securities
heretofore or hereafter authenticated and delivered shall be bound hereby.
<PAGE>

                                  Article II

                           Miscellaneous Provisions

     2.1 For all purposes of this Second Supplemental Indenture, except as
otherwise defined or unless the context otherwise requires, capitalized terms
used herein and not defined herein shall have the meaning specified in the
Indenture.

     2.2 THIS SECOND SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE
AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF
CONFLICTS OF LAW.

     2.3 All provisions in this Second Supplemental Indenture respecting the
Company shall bind or inure to the benefit of (as the case may be) the Company,
its successors or assigns.

     2.4 The recitals contained herein shall be taken as the statements of the
Company and GTS and the Trustee assumes no responsibility for their correctness.
The Trustee makes no representations as to the validity of this Second
Supplemental Indenture.

     2.5 This Second Supplemental Indenture may be executed in any number of
counterparts, each of which shall be an original, but such counterparts shall
together constitute but one and the same instrument.

                                    ********

                                       2

<PAGE>

     IN WITNESS WHEREOF, the of parties hereto have caused this Second
Supplemental Indenture to be duly executed as the date first above written.

                                           PACER INTERNATIONAL, INC.

                                           By:__________________________________
                                              Name:_____________________________
                                              Title:____________________________

                                           GTS TRANSPORTATION SERVICES, INC.,as
                                           Guarantor

                                           By:__________________________________
                                              Name:_____________________________
                                              Title:____________________________

                                           WILMINGTON TRUST COMPANY, as Trustee

                                           By:__________________________________
                                              Name:_____________________________
                                              Title:____________________________

                                       3<PAGE>

                                                                     EXHIBIT 4.5
                         THIRD SUPPLEMENTAL INDENTURE

     THIRD SUPPLEMENTAL INDENTURE dated as of October 31, 2000, by and among
Pacer International, Inc., a Tennessee corporation (the "Company"), RFI Group,
                                                         -------
Inc., a Delaware corporation ("RFI"), Ocean World Lines, Inc., a Delaware
                               ---
corporation ("OWL"), RF International, Ltd., a New York corporation ("RF
              ---                                                     --
International") and Wilmington Trust Company, as trustee (the "Trustee"), under
-------------                                                  -------
the Indenture (referred to hereinafter), pursuant to which the Company issued
its 11 3/4% Senior Subordinated Notes due 2007 (the "Securities").
                                                     ----------

                                  WITNESSETH:

     WHEREAS, the Company, the Guarantors named therein, and the Trustee
executed and delivered a certain Indenture dated as of May 28, 1999 (the
"Indenture"), providing for the issuance of up to an aggregate principal amount
 ---------
of $150,000,000 of the Securities;

     WHEREAS, the Company by appropriate action has determined that it is
desirable to amend certain provisions of the Indenture; and

     WHEREAS, pursuant to a Stock Purchase Agreement dated October 31, 2000,
among the Company, the stockholders of RFI, and certain other individuals and
entities, the Company is acquiring all of the issued and outstanding capital
stock of RFI; and

     WHEREAS, Section 4.18 of the Indenture provides that under certain
circumstances the Company is required to cause Domestic Restricted Subsidiaries
that are not Guarantors to execute and deliver to the Trustee a supplemental
indenture and Guarantee (as defined in the Indenture) pursuant to which such
Domestic Restricted Subsidiaries shall unconditionally guarantee all of the
Company's obligations under the Securities and the Indenture on the terms set
forth in the Indenture.

     NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, RFI, OWL,
RF International, the Company and the Trustee mutually covenant and agree for
the equal and ratable benefit of the holders of the Securities as set forth
below.

                                   ARTICLE I

                                   AMENDMENT

     1.1  Each of RFI, OWL, and RF International (each a "Newly Acquired
                                                          --------------
Subsidiary") hereby, jointly and severally with all other Guarantors,
----------
unconditionally and irrevocably guarantees, on a senior subordinated basis, the
Company's obligations under the Indenture and the Securities on the terms and
subject to the conditions set forth in Article Eleven of the Indenture.

     1.2  Except as expressly amended hereby, the Indenture is in all respects
ratified and confirmed and all of the terms, conditions and provisions thereof
shall remain in full force and effect. This Third Supplemental Indenture shall
form a part of the Indenture for all purposes, and every holder of Securities
heretofore or hereafter authenticated and delivered shall be bound hereby.
<PAGE>

                                  ARTICLE II

                           MISCELLANEOUS PROVISIONS

     2.1  For all purposes of this Third Supplemental Indenture, except as
otherwise defined or unless the context otherwise requires, capitalized terms
used herein and not defined herein shall have the meaning specified in the
Indenture.

     2.2  THIS THIRD SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE
AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF
CONFLICTS OF LAW.

     2.3  All provisions in this Third Supplemental Indenture respecting the
Company shall bind or inure to the benefit of (as the case may be) the Company,
its successors or assigns.

     2.4  The recitals contained herein shall be taken as the statements of the
Company and each Newly Acquired Subsidiary and the Trustee assumes no
responsibility for their correctness. The Trustee makes no representations as to
the validity of this Third Supplemental Indenture.

     2.5  This Third Supplemental Indenture may be executed in any number of
counterparts, each of which shall be an original, but such counterparts shall
together constitute but one and the same instrument.

                                    ********

                                       2
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Third Supplemental
Indenture to be duly executed as the date first above written.

                                      PACER INTERNATIONAL, INC.

                                      By:_____________________________________
                                          Name:_______________________________
                                          Title:______________________________

                                      RFI GROUP, INC.

                                      By:_____________________________________
                                          Name:_______________________________
                                          Title:______________________________

                                      OCEAN WORLD LINES, INC.

                                      By:_____________________________________
                                          Name:_______________________________
                                          Title:______________________________

                                      RF INTERNATIONAL, LTD.

                                      By:_____________________________________
                                          Name:_______________________________
                                          Title:______________________________

                                      WILMINGTON TRUST COMPANY

                                      By:_____________________________________
                                          Name:_______________________________
                                          Title:______________________________

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