A Quebec jury began deliberations today as to whether three former Montreal, Maine and Atlantic (MMA) railway workers are criminally negligent in the July 2013 Lac Megantic explosion and fire, CBC Radio-Canada reported Wednesday.

The disaster occurred when a crude-by-rail train was parked at the top of a hill rolled down into the town, derailed, exploded and caught fire - killing 47 people in the process.

"Ex-MMA locomotive engineer Tom Harding, 56, rail traffic controller Richard Labrie, 59, and operations manager Jean Demaî...