RULE 129. SWITCHING LIMITS. (a) Where an individual carrier not now having the right to change existing switching limits where yard crews are employed, considers it advisable to change the same, it shall give notice in writing to the General Chairman or General Chairmen of such intention, specifying the changes it proposes and the conditions, if any, it proposed shall apply in event of such change. The carrier and the General Chairman or General Chairmen shall, within thirty (30) days, endeavor to negotiate an understanding .

In the event the carrier and the General Chairman or General Chairmen cannot so agree on the matter, the dispute shall be submitted to arbitration as provided for in the Railway Labor Act, as amended, within sixty (60) days following the date of the last conference. The carrier shall designate the exact questions or conditions it desires to submit to arbitration and the General Chairman or General Chairmen shall designate the exact questions or conditions such General Chairman or General Chairmen desire to submit to arbitration. Such questions or conditions shall constitute the questions to be submitted to arbitration. The decision of the Arbitration Board will be made within thirty (30) days after the Board is created, unless the parties agree at any time upon an extension of this period. The award of the Board shall be final and binding on the parties and shall become effective thereafter upon seven (7) days' notice by the carrier.

(b) This rule shall in no way affect the changing of yard or switching limits at points where no yard crews are employed.