<P> John F. Kennedy and Newark Liberty airports are served by intermodal rail systems . AirTrain JFK is an 8.1 mi (13 km) rapid transit system that connects 24 hours a day Kennedy to New York's subway and commuter rail network in Queens . It also provides free transit between airport terminals . For trips beyond the airport, the train costs $5 . Roughly 4 million people rode the AirTrain to and from Kennedy in 2006, an increase of about 15% over 2005 . AirTrain Newark is a 1.9 - mile (3 km) monorail system connecting Newark's three terminals to commuter and intercity trains running on the Northeast Corridor rail line . </P> <P> New York City's commuter rail system is the most extensive in the United States, with about 250 stations and 20 rail lines serving more than 150 million commuters annually in the tri-state region . Commuter rail service from the suburbs is operated by two agencies . The MTA operates the Long Island Rail Road on Long Island and the Metro - North Railroad in the Hudson Valley and Connecticut . New Jersey Transit operates the rail network west of the Hudson River . These rail systems converge at the two busiest train stations in the United States, Penn Station and Grand Central Terminal, both in Manhattan . </P> <P> While rail freight transportation in New York City and Long Island has atrophied (most freight activity takes place in northern New Jersey), the city has more frequent passenger rail service (intercity and commuter) than anywhere else in the nation . Intercity service is provided by Amtrak . Fifty - four trains run each day on the busiest route--the Northeast Corridor from New York to Philadelphia . For trips of less than 500 miles (800 km) to other Northeastern cities, Amtrak is often cheaper and faster than air travel . Amtrak accounts for 47% of all non-automobile intercity trips between New York and Washington, D.C. and about 14% of all intercity trips (including those by automobile) between those cities . Amtrak's high - speed Acela trains run from New York to Boston and Washington, D.C., via the Northeast Corridor, using tilting technology and fast electric locomotives . New York City's Penn Station is the busiest Amtrak station in the United States by annual boardings . In 2004 it saw 4.4 million passenger boardings, more than double the next busiest station, Union Station in Washington, D.C. </P> <P> Overnight trains connect New York City with Chicago (where numerous connections are available to the west coast services), Atlanta, New Orleans, and Miami . There are two daily trains to Miami, while another train provides daytime service to Savannah . Chicago is connected with New York City by two trains: one runs daily via Upstate New York and Cleveland, while another runs three times a week on a longer route via Cincinnati . Major destinations with frequent service include Albany, Baltimore, Boston, Harrisburg, Philadelphia, Providence, and Washington, D.C. . There are also international daily trains to Toronto and Montreal in Canada, via the Empire Corridor to Albany and points west . </P>

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