What is a Bump?
1959 UTU System Agreement
Rule 68 (b) reads...
TRAINMEN DISPLACED
Trainmen will be promptly notified when a senior Trainmen has taken their position and will then be permitted to take what their age and rank entitles them to. Trainmen will be considered displaced as soon as they are notified that a senior trainmen has taken their position. A displaced trainman whose seniority will not permit him to hold an assignment, either regular or temporary, at time he is displaced will automatically revert to the extra board.
NOTE: Trainman exercising displacing rights on new or vacant positions which are open for applications for the five-day period, will be required to make written application for same; otherwise will be denied the privilege of displacing a junior trainman assigned at the expiration of the five-day period.





That is a very vague question that would wholly depend on the circumstances. [@andrealbano9]