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Noun

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contact wire (plural contact wires)

  1. (rail transport) A bare wire conducting electricity, often the lower part of the catenary, which comes into contact with a raised pantograph or other form of current collector.
    • 1962 March, “The New Year Freeze-up on British Railways”, in Modern Railways, page 158:
      Overhead electric equipment generally stood up well both to the weight of vertically falling snow and to the effects of snow on contact wires; [...].