Canal Street R Subway

This huge, unwieldy, multilevel station serves Chinatown in Manhattan and connects a few key lines – that converge in several other stations as well – the IRT, known as the 4, 5, and 6; the BMT, known as the N, Q, and R, and the J, M, and Z.
IRT (Interborough Rapid Transit) and BMT (Brooklyn-​Manhattan Transit) were originally separate transit companies altogether, and there was also the IND (Independent) which serves the 6^th and 8^th avenue lines. The tracks and trains of the IRT are narrower than BMT and IND, which is why you may sometimes see an A train running on F lines, but you’ll never see the 6 train running on the R line. (More at A Brief History of the Subway
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The amount of walking you have to do in this station just to get to another subway platform can be insane, especially now that they’ve re-​opened the Q platform at the lowest level. The renovation of the mosaic tiles is very nice and very «Chinatown.» (This was referred to as the «Disneylandization of Chinatown» in my Urban Anthropology class in college.)