Abandoned Stations: Closed underground stations on subways, trolleys, and mainline railways in and near New York City. History, diagrams, photos.
MTA Subways: The Metropolitan Transit Authority's official site for the subways of New York City.
New York Underground: Companion site to the episode of PBS's "The American Experience" about the history of New York City's mass transit systems.
NJ Transit / PATH / NYC Subway: Includes New Jersey Transit schedules and station information, New York City subway directions, Port Authority Trans-Hudson information, and many tools to help plan a trip using public transportation in New York City.
NYC Subway Resources: Features historical and technical information about the New York subway system, including images, maps, and museum collections.
NYSubway.com: Unofficial website features maps, service advisories, and news.
Subway Info: Provides door-to-door directions via the subway system, including options for different times of day.
The New York City Subway Tour: Tourist information on how to use the subway system.
The New York Subway System: Information regarding rolling stock, stations, history, and facts about the subway system. Includes a subway quiz, and several subway-related games.