10 ms·Trains slow down and use the engine at a slower pace. You don't have a back up heart.by paulie_a 8y agoTrains slow down and use the engine at a slower pace. You don't have a back up heart.agumonkey 8y agotheir braking system is passive, no energy means error means brakes engaged; unlike, say, cars where no energy means .. nothing and any accident can occur.paulie_a 8y agoHow are cars relevant? I was specifically pointing out trains.