Volvo has introduced a system called "City Safety" that reduces the chance of low-speed crashes in which the driver fails to brake in time, usually causing a rear-end collision.
This is normally done by charging the brake pipe fully from one end of the train and checking that it has charged at the other end.
通常的做法是从列车制动管的一端充气，观察另一端的变化。
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On the many cases of active braking in the front of freight train, this paper analyzed the reason from the aspect of locomotive and vehicle brake, at the end, the prevention measurements were given.