A first estimate. Most depths come from rules of thumb for each kind of structure, pinned to real numbers where the MTA lists how far a station's elevators travel. The band around the rail on a profile is one standard deviation.

Track and routes from OpenStreetMap. Ground height from USGS 3DEP lidar, river and harbour beds from NOAA CUDEM. Elevator rises from the MTA elevator and escalator inventory. Basemap from OpenFreeMap,OpenMapTiles and OpenStreetMap. Drawn with CesiumJS.