RULE 84 TRANSFERRING. (a) Engineers temporarily transferred will have the privilege of returning to their respective districts before other men are employed or promoted on such districts. If permanent transfer is desired, they must so decide within 3 months, and in that case will rank as new men with date carrying any portion of last 90 days continuous service.

(b) Engineers on different seniority districts may exchange positions with the approval of the General Chairman and General Manager, and where transfer is made, the employes will each take the seniority date of the junior employe making the change.