S-3.3, r. 2 - Regulation respecting rail safety

Full text
21. A locomotive engineer must ring the locomotive bell at least 20 seconds before it comes to a level crossing and until the locomotive or the equipment is fully engaged on the level crossing.
Under no circumstances may an engineer cross a level crossing using a locomotive that does not have an operational bell.
O.C. 1401-2000, s. 21.