I’ve been wondering about this question for a long time. Every single car in a train has its own brakes, so the train should stop in the same distance that it takes one car to stop. Why is this not the case? Or does each car take a mile to stop on its own?
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They are very heavy and their wheels are steel on a steel track. This means they have very low rolling resistance, which is part of why trains are so efficient at moving freight. Once you get it moving it doesn’t take much to keep it moving. There is very little grip between the wheel and track to slow The train down. The downside is that emergency braking takes a long time. Emergency braking also destroys the wheels and damages the track. It can take up to a mile for the train as a whole to come to a stop, they can also be over a mile long and loaded with heavy things like gravel and paper.
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