有运送旅客的火车，运载动物的火车，还有运载货物的火车。
There are trains to carry people, trains to carry animals, and trains to carry things.
火车并不是每个地方都去，而马车的速度慢，载货量也有限。
The trains did not run everywhere and horses were slow and could carry only limited loads.
一辆满载货物的火车在驶过华盛顿的Anacostia河流时，7节车厢出轨翻车了。
Seven cars of a freight train in Washington have derailed over the Anacostia River.
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