Definition of live rail in English:

live rail

noun

词汇	live rail
释义	Definition of live rail in English: live rail noun An additional rail supplying electric current, used in some electric railway systems. a girl has died after stepping on a live rail Example sentencesExamples British Transport police said the woman was lucky to be alive because the live rail had been carrying 750 volts. As well as the risk of being hit by a train, there is the risk of electrocution from live rails or overhead lines. He had fallen onto the line and broken his leg, and it took some time to switch off the live rail. We had to stick close together and avoid the live rail. If he had moved his leg one foot, he would have touched the live rail and there's 750 volts going through that. She hoped that publicity surrounding the case would help to highlight the dangers of live rails.
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