车钩结构要随着列车重量和速度的提高而不断更新。
The structure of couplers should be updated continuously with the increase of train weight and speed.
现阶段我国铁路的行车密度已经居于世界前列，行车速度提高的余地又不大，相比之下提高列车重量有着很大的潜力。
It is clear in our county that the traveling density of the railway is very high in the world and it is hard to increase the traveling speed now compared with the huge potentiality of vehicle load.
然而，混合动力列车引擎的问题和混合动力车一样：电池增加了重量。
The problem of hybrid trains, however, is the same as that of hybrid cars: the batteries add weight.
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