Operation
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In service, each of the shuttle tracks in operation at any given time is independent of the other; e.g., the train on track 1 simply runs back and forth on track 1, and there is no switching involved in reversing at each terminal. To provide for quick turnaround of the shuttle trains, there is an operator at each end of the train. Depending on which direction the train is traveling the operators swap jobs when the train gets to one end; one acts as the operator in the front and the other acts as conductor in the rear.
Read more about this topic: 42nd Street Shuttle
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