Track Connections To The Rest of The System
Of the four shuttle tracks, only three are in use, the former southbound express track space being used for platform space at each terminal. The former southbound local track is now Shuttle Track 1; Track 2 no longer exists; the former northbound express track is Track 3; and the former northbound local track is Track 4.
Tracks 1 and 3 are connected to each other and to the Lexington Avenue Line's southbound local track south of Grand Central station. Track 4 connects to the Broadway–Seventh Avenue Line's northbound local track north of Times Square station. There is no connection between tracks 1 and 3 on the one hand, and track 4 on the other; therefore, although the shuttle was once part of the original through-route of the first IRT subway, it is now physically impossible for a train to go from the IRT Lexington Avenue Line through to the IRT Seventh Avenue Line or vice versa by using the shuttle tracks.
Read more about this topic: 42nd Street Shuttle
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