This map unfolds into five 'flyer-sized' sections making the task of reading the subway and railway map easier.
What I'd call the 'front' side has a map of the NY subway system, covering Manhattan, Queens, the Bronx and Brooklyn (down to Coney Island).
On the reverse is a map of the NY/NJ transit system (railways). These are lines leaving NY from its termini stations, like Grand Central, Penn station and more etc.It also includes a line into Connecticut etc.
Folded it's a good size for a jackey inside pocket and , importantly, it is generally easy to read, unlike it's cousin from the same producer, the Manhattan Subways/Bus map that I also purchased.