It is possible to obtain a New York City travel map that includes details of the subway system. The "NYC Official Visitor's Guide" features a transportation guide and a subway guide. The guide can be downloaded from the city's official website, nycgo.com.
Information about the New York subway system can also be found at the Metropolitan Transportation Authority's website, which features subway maps, schedules, service and fare information. Maps are downloadable in PDF versions. The MTA site additionally features information about rail and bus travel, as well as car travel on the bridges and tunnels going to and from New York City.