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Twin unit

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services, married pairs may have machinery necessary for full operation of the cars split between them. Items that are typically shared include
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such a pair may be slightly higher when the extra car in such a pair is not needed to meet level-of-service demands at a particular time.
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which are permanently coupled and treated as if they were a single unit. A twinset of cars or coaches can also be called a
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Married Pair, 2 Car MUNI LRV2/3 on the N Judah, San Francisco, CA.
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passenger railroad parlance, twin units are also known as
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The economics of single vs. married-pair transit cars
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Married pair
Marriage
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worldwide view
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"Twin unit"
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railroad
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