RULE: Train operators must be careful not to overrun station platforms. Should this happen, however, they must give a prescribed whistle signal and wait for the prescribed signal from the conductor before proceeding. Under no circumstances will train operators back the train if they have overrun platforms: The most likely reason for this rule is based on the fact that
a. the train operator cannot see conditions at the other end of the train
b. backing the train is dangerous
c. passengers may be disoriented
d. it causes delays in the schedule