Here is an interesting Subway chart from 1904 with a depth chart. http://talk.nycsubway.org/perl/read?subtalk=589316 http://talk.nycsubway.org/perl/read?subtal

Here is an interesting Subway chart from 1904 with a depth chart. http://talk.nycsubway.org/perl/read?subtalk=589316 http://talk.nycsubway.org/perl/read?subtalk=589316