A third rail is an additional rail, placed beside the regular tracks, that supplies electrical power to trains. Instead of using overhead wires, trains draw power from the third rail through a special device called a shoe, which touches the rail and transfers electricity. This system is commonly used in subways, urban transit, and other rail systems where overhead wires might not be practical. The third rail is typically located close to the ground and is carefully insulated for safety to prevent accidents.

英語での「third rail」の定義と意味

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