Amtrak operates the following intercity and long-distance passenger train routes. Current routes Amtrak service is divided into three categories of routes: Northeast Corridor routes, state-supported routes, and long distance routes. These types indicate how the service is funded. Northeast Corridor service is directly subsidized by federal appropriations. Federally-supported long distance services are subsidized by appropriations under a separate line item from the NEC in federal budgets. Additionally, Amtrak partners with 17 states to provide additional short- and medium-distance services desired by those states. They are subsidized by periodic payments to Amtrak from the state partners. Three routes – the Carolinian, Northeast Regional, and Vermonter – are state-subsidized only on the sections of their routes off the Northeast Corridor (north of New Haven, and south of Washington). The Northeast Regional and San Joaquin have branches served by different trips, while the Empire Builder and Lake Shore Limited split into two sections to serve branches. On the Capitol Corridor, Cascades, Empire Service, Keystone Service, Northeast Regional, and Pacific Surfliner, some or all trips do not run the full length of the route. Full listing This listing included current and discontinued routes operated by Amtrak since May 1, 1971. Some intercity trains were also operated after 1971 by the Alaska Railroad, Chicago, Rock Island and Pacific Railroad, Chicago South Shore and South Bend Railroad, Denver and Rio Grande Western Railroad, Georgia Railroad, Reading Company, and Southern Railway. The Southern Railway and D&RGW routes were taken over by Amtrak in 1979 and 1983 respectively. Northeast Corridor As inherited from Penn Central, most names for Northeast Corridor trains – except for the Metroliner and Clocker– were used for only one one-way or round-trip train. These names were frequently changed from the 1970s to the 1990s. These named trains were consolidated under the NortheastDirect brand in 1995, though individual names appeared on timetables from 1996 to 1999. The Acela Regional brand was used for all-electric service beginning in 2000. Northeast Corridor service, except for the Acela Express, was rebranded Regional in 2003 and finally Northeast Regional in 2008. This listing shows only trains operated primarily on the Northeast Corridor and the New Haven–Springfield Line, plus extensions of those trains into Virginia. Trains serving endpoints outside these areas are listed separately. Empire Corridor Trains operating over the Empire Corridor (the former New York Central Railroad Water Level Route) are now collectively known as the Empire Service. The