SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                     PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
                       THE SECURITIES EXCHANGE ACT OF 1934

                           For the month of June 2003

                          TRANSCANADA PIPELINES LIMITED
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               (Exact Name of Registrant as Specified in Charter)


            450 - 1ST STREET S.W., CALGARY, ALBERTA, T2P 5H1, CANADA
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                    (Address of Principal Executive Offices)


         Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F:

                  Form 20-F                          Form 40-F  X
                           ----                               ----

         Indicate by check mark whether by furnishing the information contained
in this Form, the registrant is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                       Yes                                 No   X
                           ----                               ----






         The following document is hereby filed with the Securities and Exchange
Commission for the purpose of being (and hereby is) incorporated by reference as
an additional exhibit into Registration Statement on Form F-9 (File No.
333-101140):

          4.10   Underwriting Agreement dated June 9, 2003 between TransCanada
                 PipeLines Limited and the underwriters listed therein.









                                    SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                        TRANSCANADA PIPELINES LIMITED

Date:  June 10, 2003

                                        By:  /s/ Rhondda E.S. Grant
                                           -------------------------------------
                                             Name:  Rhondda E.S. Grant
                                             Title: Vice-President and Corporate
                                                    Secretary





                                  EXHIBIT INDEX


4.10  Underwriting Agreement dated June 9, 2003 between TransCanada PipeLines
      Limited and the underwriters listed therein.