The Long Island Rail Road, often abbreviated as the LIRR, is a commuter rail system in the southeastern part of the U.S. state of New York, stretching from Manhattan to the eastern tip of Suffolk County on Long Island. With an average weekday ridership of 354,800 passengers in 2016, it is the busiest commuter railroad in North America. It is also one of the world's few commuter systems that runs 24/7 year-round. It is publicly owned by the Metropolitan Transportation Authority, which refers to it as MTA Long Island Rail Road. In 2022, the system had a ridership of 70,342,700, or about 253,800 per weekday as of the second quarter of 2023.
The Hell Gate Bridge, originally the New York Connecting Railroad Bridge or the East River Arch Bridge, is a 1,017-foot (310 m) steel through arch railroad bridge in New York City. Originally built for four tracks, the bridge currently carries two tracks of Amtrak's Northeast Corridor and one freight track across the Hell Gate, a strait of the East River, between Astoria in Queens and Randalls and Wards Islands in Manhattan.
The Northeast Corridor (NEC) is an electrified railroad line in the Northeast megalopolis of the United States. Owned primarily by Amtrak, it runs from Boston in the north to Washington, D.C. in the south with major stops in Providence, New Haven, Stamford, New York City, Trenton, Philadelphia, Wilmington, and Baltimore. The NEC closely parallels Interstate 95 for most of its length, and is the busiest passenger rail line in the United States both by ridership and by service frequency as of 2013. The NEC carries more than 2,200 trains daily.
The New York Tunnel Extension is a combination of railroad tunnels and approaches from New Jersey and Long Island to Pennsylvania Station in Midtown Manhattan.
The Oak Point Link, also known as the South Bronx–Oak Point Link, is a 1.9-mile (3.1 km) long railroad line in the Bronx, New York City, United States, along the east bank of the Harlem River. It connects the Metro-North Railroad's Hudson Line with the Harlem River Intermodal Yard and the CSX Transportation Oak Point Yard at the north end of the Hell Gate Bridge.
Railroad electrification in the United States began at the turn of the 20th century and comprised many different systems in many different geographical areas, few of which were connected. Despite this situation, these systems shared a small number of common reasons for electrification.
The East River Tunnels are four single-track railroad passenger service tunnels that extend from the eastern end of Pennsylvania Station under 32nd and 33rd Streets in Manhattan and cross the East River to Long Island City in Queens. The tracks carry Long Island Rail Road (LIRR) and Amtrak trains travelling to and from Penn Station and points to the north and east. The tracks also carry New Jersey Transit trains deadheading to Sunnyside Yard. They are part of Amtrak's Northeast Corridor, used by trains traveling between New York City and New England via the Hell Gate Bridge.
The Bay Ridge Branch is a rail line owned by the Long Island Rail Road (LIRR) and operated by the New York and Atlantic Railway in New York City. It is the longest freight-only line of the LIRR, connecting the Montauk Branch and CSX Transportation's Fremont Secondary at Glendale, Queens with the Upper New York Bay at Bay Ridge, Brooklyn.
Amtrak's 25 Hz traction power system is a traction power network for the southern portion of the Northeast Corridor (NEC), the Keystone Corridor, and several branch lines between New York City and Washington D.C. The system was constructed by the Pennsylvania Railroad between 1915 and 1938 before the North American power transmission grid was fully established. This is the reason the system uses 25 Hz, as opposed to 60 Hz, which is the standard for power transmission in North America. In 1976, Amtrak inherited the system from Penn Central, the successor to the Pennsylvania Railroad, along with the rest of the NEC infrastructure.
Pulse code cab signaling is a form of cab signaling technology developed in the United States by the Union Switch and Signal corporation for the Pennsylvania Railroad in the 1920s. The 4-aspect system widely adopted by the PRR and its successor railroads has become the dominant railroad cab signaling system in North America with versions of the technology also being adopted in Europe and rapid transit systems. In its home territory on former PRR successor Conrail owned lines and on railroads operating under the NORAC Rulebook it is known simply as Cab Signaling System or CSS.
The Southeastern Pennsylvania Transportation Authority (SEPTA) operates a 25 Hz traction power system in the vicinity of Philadelphia, Pennsylvania, that it inherited from the Reading Railroad. This system is separate from but similar to the system designed by the Pennsylvania Railroad, which is now operated by Amtrak. SEPTA's trains can run over either system because the voltage and frequency presented to the locomotive are essentially identical. However, the ex-Reading system is not electrically connected to the ex-PRR system.
Amtrak operates a 60 Hz traction power system along the Northeast Corridor between New Haven, Connecticut, and Boston, Massachusetts. This system was built in the late 1990s and supplies locomotives with power from an overhead catenary system at 25 kV alternating current with a frequency of 60 Hz. The system is also commonly known as the Northend Electrification, in contrast to the Southend Electrification that runs between New York City and Washington, D.C.
The New York, New Haven and Hartford Railroad pioneered electrification of main line railroads using high-voltage, alternating current, single-phase overhead catenary. It electrified its mainline between Stamford, Connecticut, and Woodlawn, New York, in 1907 and extended the electrification to New Haven, Connecticut, in 1914. While single-phase AC railroad electrification has become commonplace, the New Haven's system was unprecedented at the time of construction. The significance of this electrification was recognized in 1982 by its designation as a Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers (ASME).
From the start of railroading in America through the first half of the 20th century, New York City and Long Island were major areas for rail freight transportation. However, their relative isolation from the mainland United States has always posed problems for rail traffic. Numerous factors over the late 20th century have caused further declines in freight rail traffic. Efforts to reverse this trend are ongoing, but have been met with limited success.
Fresh Pond Junction is a freight yard in the Ridgewood and Glendale neighborhoods of Queens, New York City. It is operated by the New York & Atlantic Railway, which serves Long Island, New York using tracks owned by the Long Island Rail Road (LIRR). The yard has been in operation since the early 20th century and is the primary rail freight yard on the island.
Harold Interlocking is a large railroad junction located in New York City. It is the busiest rail junction in the United States. It serves trains on Amtrak's Northeast Corridor and the Long Island Rail Road's Main Line and Port Washington Branch, which diverge at the junction.
The Hell Gate Line is the portion of Amtrak's high-speed Northeast Corridor between Harold Interlocking in Sunnyside, Queens and Shell Interlocking in New Rochelle, New York.
