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Easier, get a braked throttle then hold a car on the rails with rear wheels in the air, get it up to full speed and then lift off the rails, the motor speed will decay slowly as it slows down. Now same position and let go of the trigger the motor stops abruptly. If you haven't got a braked throttle you can get the same effect by just shorting the rails.

Julian and julius are both right, it is back emf, by shorting the rails you are turning the motor into a mini generator, with rails shorted it tries to supply infinite current so that takes a lot of work so the whole thing slows down in a fraction of the time.

Different motors have different braking effects, some are strong some are not, so often you will hear people complaining that a motor has no brakes. Having resistors in line reduce the braking effect as it tries to drive less current.
 
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