在一些城市，第三道铁轨(电动机车的输电轨)给通常在地下运行的地铁列车供电，电力通过这道铁轨传输。
In some cities, a third rail provides power to a subway train, usually operating underground; electricity passes through the rail.
在一些城市，第三道铁轨(电动机车的输电轨)给通常在地下运行的地铁列车供电，电力通过这道铁轨传输。
In some cities, a third rail provides power to a subway train, usually operating underground; electricity passes through the rail.
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