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                                                                    EXHIBIT 10.1


                                  AMENDMENT TO
                             STOCK OPTION AGREEMENT


       AMENDMENT dated as of November 15, 1996 (this "Amendment") to Stock
Option Agreement dated as of October 12, 1994 (the "Stock Option Agreement") by
and between TSX Corporation, a Nevada corporation, and TCI TSX, Inc., a
Colorado corporation (the "Optionee").  Capitalized terms not otherwise defined
herein are used herein as defined in the Stock Option Agreement.

                             PRELIMINARY STATEMENT

       A.     Pursuant to the Stock Option Agreement, the Company in 1994
granted an Option to the Optionee to purchase 22,227 shares of Common Stock by
virtue of the Optionee's exercise of preemptive rights with respect to grants
by the Company on July 28, 1994 to certain of its employees under the Company's
Amended and Restated Long-Term Incentive Compensation Program ("LTIP") of
options to purchase 39,000 shares of Common Stock.

       B.     The Company in 1994 made additional grants under the LTIP to
certain employees of options to purchase shares of Common Stock, thereby
entitling the Optionee, pursuant to its preemptive rights, to additional
Options to purchase shares of Common Stock.  Accordingly, the parties desire to
amend the Stock Option Agreement to include the additional Options.

                                   AMENDMENT

       NOW, THEREFORE, in consideration of the premises and covenants herein
contained, the Stock Option Agreement is hereby amended as follows:

       1.     In addition to the Options granted to the Optionee pursuant to
the Stock Option Agreement, the Company has granted and does hereby ratify and
confirm the grants as of the respective dates hereinafter set forth of the
following Options (the "Options") to purchase shares of Common Stock of the
Company on the terms herein provided and otherwise as set forth in the Stock
Option Agreement:

              (a)    An Option to purchase 17,931 shares of Common Stock was
       granted and is hereby ratified and confirmed as of July 28, 1994 at an
       Exercise Price of $4.54 per share, which Option shall be exercisable by
       the Optionee in whole or in part at any time or times for a period
       commencing as of July 28, 1994 and expiring at the close of business on
       July 28, 2004.

              (b)    An Option to purchase 4,628 shares of Common Stock was
       granted and is hereby ratified and confirmed as of July 28, 1994 at an
       Exercise Price of $5.75 per share, which Option shall be exercisable by
       the Optionee in whole or in part at any time or times for a period
       commencing as of July 28, 1994 and expiring at the close of business on
       July 28, 2004.

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              (c)    An Option to purchase 13,648 shares of Common Stock was
       granted and is hereby ratified and confirmed as of October 3, 1994 at an
       Exercise Price of $8.04 per share, which Option shall be exercisable by 
       the Optionee in whole or in part at any time or times for a period 
       commencing as of October 3, 1994 and expiring at the close of business 
       on October 3, 2004.

       The shares of Common Stock issuable upon exercise of the Options are
referred to herein and in the Stock Option Agreement as "Option Stock."
Except as otherwise herein provided, the provisions of the Stock Option
Agreement shall apply to the Options which are the subject of this Amendment.

       Share and per share amounts set forth above have been adjusted for the
two-for-one stock split in 1994 and the three-for-two stock split in 1996.

       2.     Except as amended hereby, the provisions of the Stock Option
Agreement shall remain in full force and effect.

       EXECUTED as of the day and year first above written.



                                           TSX CORPORATION
                                           
                                           
                                           By:    /s/ WILLIAM H. LAMBERT        
                                              ----------------------------------
                                                  William H. Lambert, Chairman,
                                                  President and Chief Executive
                                                  Officer
                                           
                                           TCI TSX, INC.
                                           
                                           
                                           By:  /s/ DAVID BOILEAU
                                              ----------------------------------
                                                Name: David Boileau
                                                Title: Vice-President