S-3.3, r. 2 - Regulation respecting rail safety
6. Nobody may
(1) stand in front of moving equipment;
(2) ride on the side or on the roof of moving equipment when passing side and/or overhead clearance restrictions
(3) stand on the end ladder of a moving car, except for the purpose of operating a hand brake;
(4) get on or off equipment except by using a ladder with steps and handholds.