While not strictly speaking a transit map, this awesome cutaway diagram of the Hudson River Tubes featured in our last post is just too cool not to share with you. Contemporaneous with that map, this cutaway shows the junction to the northern (or Uptown) cross-Hudson tubes which leave the image to the right. Of particular interest is how the lines stack and twist around each other, almost certainly done to minimise the width of any excavation work.

Source: Wikipedia