Amtrak Route - Keystone Corridor - (A)Amtrak Keystone Corridor (A)Amtrak Route - Keystone Corridor (A)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. | Name | Indicates Amtrak's name for the train, or in some cases the pre-Amtrak name for trains operating prior to November 14, 1971 | | Route | The endpoints and major intermediate stops for the train. Changes to terminal stations within the same city, as well as route changes that did not modify the endpoint cities, are not shown. | Service
Began | The date Amtrak began operating the train | Service
Ended | The date Amtrak ceased operating the train | | Notes | Additional information concerning name changes and prior operators | | ‡ | Trains conveyed to Amtrak either on May 1, 1971, or afterward | | † | Trains that are currently operating | | †‡ | Trains conveyed to Amtrak that are currently operating | Current Amtrak Route - Keystone Corridor (A)Trains providing local intercity service on the Philadelphia to Harrisburg Main Line (the former Pennsylvania Railroad main line) to Harrisburg are now collectively known as the Keystone Service, a name originally introduced in 1981. From 1990 to 2006, individual trains were listed in timetables as Keystone, a name also applied to two different trains in 1971–72 and 1979–81. This table includes only trains that did not operate west of Harrisburg. | Name | Route | Service
Began | Service
Ended | Notes | Atlantic City Express
(Amtrak train) | Atlantic City - Harrisburg | April 7, 1991 | April 1, 1995 | One of three branches of the service | Big Apple
(Through Service - Keystone Service) | New York City - Harrisburg | April 27, 1980 | April 30, 1994 | Weekend-only extension of a Clocker. Merged into Keystone Service | Keystone
(Pennsylvanian train) | New York City - Harrisburg | April 27, 1980 | October 24, 1981 | Weekend-only extension of a Clocker. Renamed Susquehanna | Keystone Executive
Declining Service - Keystone Service) | Philadelphia - Harrisburg | April 24, 1983 | 1986 | Replaced a Keystone Service train. Discontinued during cuts to corridor service | Keystone Service
(train) † | Philadelphia - Harrisburg | October 25, 1981 | October 29, 1994 | Renamed from Silverliner Service. Some trains extended to New York beginning in 1994 | | New York City - Harrisburg | October 30, 1994 | present | | Keystone State Express
(Through Service - Keystone Service) | New York City - Harrisburg | April 1, 1990 | Mid-1990s | Replaced Valley Forge. Merged into Keystone Service | Metroliner
(train) | Downingtown - Washington, D.C. | April 1, 1990 | October 26, 1991 | A single one-way trip, #201, was the only Metroliner service ever operated off the Northeast Corridor | Silverliner Service
(train) ‡ | Philadelphia (Suburban) - Harrisburg | October 29, 1972 | October 24, 1981 | Replaced Penn Central 600-series trains. Renamed Keystone Service | Susquehanna
(Through Service - Keystone Service) | New York City - Harrisburg | October 25, 1981 | October 29, 1994 | Replaced Keystone. Merged into Keystone Service | Valley Forge
(Through Service - Keystone Service) | New York City - Harrisburg | October 28, 1973 | March 30, 1990 | Renamed Keystone State Express | | Boston - Harrisburg | May 19, 1974 | October 25, 1975 | Additional weekend-only service | |
