An electric circuit made in a section of railway track as an aid to signalling, and able to be short-circuited by the presence of a train.
（铁路）轨道电路
Example sentencesExamples
In our opinion they could not reasonably have foreseen that these track circuits could have caused problems of this nature at a distance of 60 to 70 metres.
It was a broken track circuit today - something like that - I'm not so good on my railway terminology.
Once the westbound train has progressed and the caboose is no longer occupying the detector track circuit of interlocking all intermediate signals will return to their normal status.
When there are track problems, it could be a number of things - such as a track circuit, a broken rail or whatever.
There had been a track circuit failure at Erith and the driver announced there would be a coach replacement service.