Crash Video Released

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Yes, it is physics, but while the weight of the train exceeds that of the car many tens of times, so is the car's braking system many times stronger per unit weight of the vehicle than is that of the train. If trains had braking systems to match the efficiency of cars, trains would either have to change to compound tire surfaces and track, or they would simply slide until they stopped. Unfortunately, sliding is dangerous and highly deleterious to both the rails and the tires...which will quickly turn flat. So, properly functioning train brakes are going to allow the wheels to keep turning, which with their coefficient of friction on steels rails, means they must continue to turn for a very long while after a full or emergency application.
-Crandell