Oh, here's something else I forgot to attach yesterday.
Next time you're in the Times Square station on the shuttle platform, note the alignment of this area pictured below, where you can see how the shuttle fit into the original 1903 IRT alignment (see map below). It was originally a local station, and you can see the curvature as the tracks came from 42nd St. and turned north onto Broadway. The first photo shows the middle platform which obviously was part of the southbound express tunnel. The second shows the curvature turning north on the original alignment; that's a southbound local in the distince. The third shows the part of the shuttle platform that was originally the southbound local platform going towards City Hall.
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