What Goes Up Must Come Down: A brief history of New York City's elevated rail and subway lines
NYC train map: Subways, NJ Transit, LIRR and more! - Trains
List of New York City Subway lines - Wikipedia
IND Second System Track Map – vanshnookenraggen
NYC Subway track map- the Bronx through Midtown - Maps on the Web
NEW version 2!, The Complete and Geographically Accurate New York City Track Map is a new detailed look at the entire rail network that most riders
New York City Track Map v2: Complete and Geographically Accurate
MapLab: New York City's Enduring Subway Map Debate - Bloomberg
A Complete and Geographically Accurate NYC Subway Track Map – vanshnookenraggen
New York City Subway - Traintrackr - Live LED Maps
New York Subway Track Map – The Map Room
NYC train map: Subways, NJ Transit, LIRR and more! - Trains
How to Use the NYC Subway: A Complete How-To Guide With Maps For Tourists
So there's a lot to unpack here. My main thesis was to explain the Big Picture of the subway system, describing the general arrangement of the system.
NYC Subway Map