大型火车站有列车编组用的驼峰将需要编组的车厢用火车头推到驼峰顶上让它以极小的初速度开始沿斜坡下�到坡底时利用道岔组把它引导到规定的轨道上 Template




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tomski大型火车站有列车编组用的驼峰将需要编组的车厢用火车头推到驼峰顶上让它以极小的初速度开始沿斜坡下�到坡底时利用道岔组把它引导到规定的轨道上 coloring