This incident happened in the Oshawa CP Rail yard which ships out the GM vehicles. One of the railcar men who attaches and detaches the car haulers, accidentally unhooked a set of train cars without having the brakes applied. The Oshawa rail yard has a slight incline to it, so when the set of cars was unhooked from the engine it started to roll down the hill, it smashed through the stop block and then through the fence and continued into the parking lot where GM stores the new vehicles that come off the line. Over 300 vehicles were damaged.
I guess this is where the guy just takes his lunch box and goes home.