There are three kinds of freight in transport: full-car load, Less-than-truck load and Container.
有三种货物运输形式：整车运输，零担运输和集装箱。 。
The key of acceleration and adding axle load of freight car is bogie.
铁路货车提高速度和增大轴重的关键是转向架。
The heat load borne by wheels increases after speed increase of the freight car.
货车提速后，车轮承受的热负荷相应增大。
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