Teamsters Rail Conference Canada President Lyndon Isaak says all three railroads have adjusted their policies in light of the legalization of cannabis in October.

As of Feb. 1, Go Train drivers in southern Ontario are forbidden from ever consuming cannabis, but that's not the case for their northern Ontario counterparts.

However, a union leader representing workers at CP, CN and VIA Rail says the recent changes to their drug and alcohol policies all essentially prohibit railroaders from using marijuana, even if it isn't explicitly stated.

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Erik White ~ CBC News ~