Married pair

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On railroads, a married pair is a set of two railroad cars which are permanently coupled and treated as if they were a single unit. On passenger railroads, light rail, and monorail services, married pairs may have machinery necessary for full operation of the cars split between them. (For example, one car may contain a propulsion system, while the other contains an HVAC system.)

For many models of New York City Subway cars, a married pair consists of one car with an operator's cab and one without.

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