New York City Subway largest rapid transit system in the world by number of stations, with stations in operation ( if stations connected by transfers are counted as single stations). Stations are located throughout the boroughs of Manhattan, Brooklyn, Queens, and the Bronx. The Staten Island Railway is not officially considered part of the subway, as it lacks a rail link with the subway system, so passengers traveling between Staten Island and another borough must take the Staten Island Ferry or an MTA bus; free transfers are allowed to the subway and bus systems. The PATH in Manhattan and New Jersey and the AirTrain
Staten Island the five boroughs of the expanded city. Although consolidated into the City of Greater New York in 1898, the county sheriff of Staten Island maintained control of the jail system, unlike the other boroughs who had gradually transferred control of the jails to the Department of Correction. The jail system was not transferred until January 1, 1942. Today, Staten Island is the only borough without a New York City Department of Correction major detention center. The construction of the Verrazzano-Narrows Bridge, along with the other three major Staten Island bridges, created a new way for commuters and tourists to travel