SEPTA in the context of "Delaware County, Pennsylvania"

30th Street Station, officially William H. Gray III 30th Street Station, is a major intermodal transit station in Philadelphia, Pennsylvania, United States. The station opened in 1933 as Pennsylvania Station–30th Street, replacing the 1881 Broad Street station as the Pennsylvania Railroad's main station in the city. The station is the third-busiest Amtrak station in the nation with over 4.1 million passengers as of 2023.

30th Street Station is currently metropolitan Philadelphia's main railroad station and a major stop on Amtrak's Northeast and Keystone corridors. The station is also a major commuter rail station served by all SEPTA Regional Rail lines and is the western terminus for NJ Transit's Atlantic City Line. The station is also served by several SEPTA-managed city and suburban buses and by NJ Transit, Amtrak Thruway, and various intercity operators.

Trenton is the capital city of the U.S. state of New Jersey and the county seat of Mercer County. It was the capital of the United States from November 1 until December 24, 1784. Trenton and Princeton are the two principal cities of the Trenton–Princeton metropolitan statistical area, which encompasses all of Mercer County and constitutes part of the New York combined statistical area by the U.S. Census Bureau However, Trenton is part of the Philadelphia media market and directly borders the Philadelphia metropolitan area to its west, and the city was part of the Philadelphia combined statistical area from 1990 until 2000.

In the 2020 United States census, Trenton was the fifth largest city in Central Jersey and the 10th-most-populous municipality statewide, with a population of 90,871, an increase of 5,958 (+7.0%) from the 2010 census count of 84,913, which in turn had reflected a decline of 490 (−0.6%) from the 85,403 counted in the 2000 census. The Census Bureau's Population Estimates Program calculated that the city's population was 89,661 in 2022, ranking the city the 382nd-most-populous in the country. Trenton is the only city in New Jersey that is served by three commuter rail transit systems (Amtrak, NJ Transit, and SEPTA), and the city has encouraged a spate of transit-oriented development.

The Keystone Corridor is a 349-mile (562 km) railroad corridor between Philadelphia and Pittsburgh, Pennsylvania, that consists of two rail lines: Amtrak and SEPTA's Philadelphia-to-Harrisburg main line, which hosts SEPTA's Paoli/Thorndale Line commuter rail service, and Amtrak's Keystone Service and Pennsylvanian inter-city trains; and the Norfolk Southern Pittsburgh Line. The corridor was originally the Main Line of the Pennsylvania Railroad.

Amtrak runs two intercity rail services along the Keystone Corridor: the Harrisburg-to-New York City Keystone Service and the Pittsburgh-to-New York City Pennsylvanian. SEPTA operates daily Paoli/Thorndale commuter rail service between Philadelphia and Thorndale on the Philadelphia-to-Harrisburg main line. The towns along this stretch form a socio-cultural region called the "Philadelphia Main Line".

The SEPTA Regional Rail system (reporting marks SEPA, SPAX) is a commuter rail network owned by SEPTA and serving the Philadelphia metropolitan area. The system has 13 branches and more than 150 active stations in Philadelphia, Pennsylvania, its suburbs and satellite towns and cities. It is the sixth-busiest commuter railroad in the United States. In 2016, the Regional Rail system had an average of 132,000 daily riders and 118,800 daily riders as of 2019.

The core of the Regional Rail system is the Center City Commuter Connection, a tunnel linking three Center City stations: the above-ground upper level of 30th Street Station, the underground Suburban Station, and Jefferson Station. All trains stop at these Center City stations (with the exception of the Cynwyd Line); most also stop at Temple University station on the campus of Temple University in North Philadelphia. Operations are handled by the SEPTA Railroad Division.

The Atlantic City Line (ACL) is a commuter rail line operated by NJ Transit (NJT) in the United States between Philadelphia, Pennsylvania and Atlantic City, New Jersey, operating along the corridor of the White Horse Pike. It runs over trackage that was controlled by both the Pennsylvania Railroad (PRR) and the Pennsylvania-Reading Seashore Lines. It shares trackage with SEPTA and Amtrak on the Northeast Corridor (NEC) until it crosses the Delaware River on Conrail's Delair Bridge into New Jersey.

The Atlantic City Line also shares the right-of-way with the PATCO Speedline between Haddonfield and Lindenwold, New Jersey. There are 12 departures each day in each direction. Conrail also uses short sections of the line for freight movements (which are segregated), including the NEC-Delair Bridge section to its main freight yard in Camden, New Jersey. Unlike all other NJT railway lines, the Atlantic City line does not have traditional rush hour service. The Atlantic City line is colored dark blue on New Jersey Transit's system maps, and the line's symbol is a lighthouse, an homage to the Absecon Lighthouse.

The City Transit Division of the Southeastern Pennsylvania Transportation Authority (SEPTA) operate almost all of Philadelphia's public transit, including all six trolley, three trackless trolley, and 70 bus lines within city limits. Some of the bordering municipalities are served by the City Transit division, despite not being part of the city. For example, Cheltenham Township has 13 city division routes and no Suburban Division ones. The City Transit division also operates the 400 Series routes which are designed to serve students attending schools in the city of Philadelphia.

The City Transit Division is broken down into seven districts (Allegheny, Callowhill, Comly, Elmwood, Frankford, Midvale, and Southern) and Contract Operations.

The Philadelphia and Western Railroad was a high-speed, third rail-equipped, commuter-hauling interurban electric railroad operating in the western suburbs of Philadelphia, Pennsylvania. It is now SEPTA's Norristown High Speed Line, though the Strafford spur has been abandoned. Part of the abandoned line within Radnor Township is now the Radnor Trail, a multi-use path or rail trail.

The Philadelphia Main Line, known simply as the Main Line, is an informally delineated historical and social region of suburban Philadelphia, Pennsylvania. Lying along the former Pennsylvania Railroad's once prestigious Main Line, it runs northwest from Center City Philadelphia parallel to Philadelphia and Lancaster Turnpike, also known as U.S. Route 30.

The railroad first connected the Main Line towns in the 19th century. They became home to sprawling country estates belonging to Philadelphia's wealthiest families, and over the decades became a bastion of "old money". The Main Line includes some of the wealthiest communities in the country, Villanova, Radnor, Haverford, and Merion. Today, the railroad is Amtrak's Keystone Corridor, along which SEPTA's Paoli/Thorndale Line operates.