RULE 136. ENACTMENT AND TERMINATION. This Agreement will be effective December 31, 1976, and shall continue in effect until it is changed as provided herein, or under the provisions of the Railway Labor Act.

Should either of the parties to this Agreement desire to revise these rules, thirty (30) days' written advance notice containing the proposed changes shall be given and conference shall be held immediately upon the expiration of said notice unless another date is mutually agreed upon.

It is understood and agreed that should any of the provisions of this Agreement be found to be in conflict with any Federal legislation or any superior state or municipal legislation,  be  such provision shall be void, and that any other modification or interpretation shall be of no force nor effect unless concurred in by the signatories thereof.