rail return current
... rail resistance 钢轨电阻，干线电阻 rail return current 钢轨回流 railroad 铁路 ...
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在电气化铁路轨道电路中，两条钢轨即是轨道信号的传输线，又是电力机车牵引电流返回变电所的回流线。
In electric railway track circuit, the two steel tracks are both transmission line of the track signal and return line for electric locomotive tractive current back to electric substation.
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