In DC rail transit systems, the running rails are usually used as the return conductor for traction current.
城市轨道交通的供电系统一般采用直流供电，并以轨道作为回流的通路。
The two rails are not only signal lines of track circuits, but also loop current line of locomotive traction current in electrified railway block.
电力牵引区段的两条钢轨，既作为轨道电路的通道来传输信号电流，又作为牵引电流的回路来传送牵引电流。
The interference of the traction current is one of the important subject in the major of railway signal. The use of ballastless track will influence it's condition.
牵引电流干扰是铁路信号专业的一个重要课题，采用无砟轨道之后会给轨道电路抗牵引电流干扰带来一定的影响。
The interference of the traction current is one of the important subject in the major of railway signal. The use of ballastless track will influence it's condition.
牵引电流干扰是铁路信号专业的一个重要课题，采用无砟轨道之后会给轨道电路抗牵引电流干扰带来一定的影响。
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