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MU car

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noun Railroads.
  1. multiple-unit car.

multiple-unit car

[muhl-tuh-puh l-yoo-nit]
noun
  1. a self-propelled railroad car, generally used in commuting service, equipped so that a train of such cars can be operated from any one of them.
Also called MU car.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018