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Acela
Acela, also known as Acela Express or Amtrak Acela, is Amtrak's high-speed train service on the Northeast Corridor linking Washington, DC, New York City, and Boston, launched in 2000.
Adelaide Metro
Adelaide Metro is the public transport system of Adelaide, South Australia, operating buses, trains, and trams across greater metropolitan Adelaide, recording nearly 70 million passenger trips in 2024–25.
Adif
Adif (Administrador de Infraestructuras Ferroviarias) is Spain's state-owned railway infrastructure manager, created in 2005 when RENFE was split. It manages over 11,600 km of track, 1,448 stations, and the high-speed network.
Adirondack (train)
The Adirondack is a daily Amtrak train between New York City and Montreal, launched in 1974 and known for its scenic route along the Hudson and Lake Champlain.
Adler (locomotive)
The Adler (German for "Eagle") was a steam locomotive built by Robert Stephenson & Co. in 1835 and the first used commercially in Germany, on the Nuremberg–Fürth railway.
Advanced Civil Speed Enforcement System
The Advanced Civil Speed Enforcement System (ACSES) is a transponder-based Positive Train Control system used on Amtrak's Northeast Corridor, ordered by the FRA in 1998, enforcing civil speed restrictions as an overlay on cab signal systems.
Advanced Passenger Train
The Advanced Passenger Train (APT) was a British Rail tilting train program of the 1970s and early 1980s that set a British speed record of 161 mph.
Aérotrain
The Aérotrain was a French experimental high-speed vehicle that floated on an air cushion above a concrete track, developed under engineer Jean Bertin from 1965 to the late 1970s.
Agenoria (locomotive)
Agenoria is an early British 0-4-0 steam locomotive built in 1829 by Foster, Rastrick & Co of Stourbridge for the Shutt End Colliery Railway, and is preserved at the National Railway Museum in York.
Agra Metro (आगरा मेट्रो)
Agra Metro (आगरा मेट्रो) is a rapid transit system in Agra, India, which began passenger service in 2024 on a 6 km corridor serving the Taj Mahal.
Ahmedabad–Bhuj Namo Bharat Rapid Rail
The Ahmedabad–Bhuj Namo Bharat Rapid Rail is a fully air-conditioned, unreserved intercity train run by Western Railway between Ahmedabad and Bhuj, inaugurated in September 2024.
Airport Rail Link (Bangkok)
The Airport Rail Link, also known as the Suvarnabhumi Airport Link, is an elevated rail service in Bangkok linking Suvarnabhumi Airport to central Phaya Thai, opened in 2010.
Akita Shinkansen (秋田新幹線)
Akita Shinkansen (秋田新幹線), a JR East mini-Shinkansen Komachi service from Tokyo to Akita via Morioka over the regauged Tazawako and Ōu lines; E6 sets, 320/130 km/h, fastest 3:37.
Alaska Railroad
The Alaska Railroad is a state-owned railroad in Alaska whose 470-mile main line runs from Seward to Fairbanks, carrying freight and scheduled year-round passenger service.
ALCO diesel locomotives
The ALCO diesel locomotives were built by the American Locomotive Company in Schenectady, New York, from 1920s experiments until the final units in January 1969.
ALCO PA
The ALCO PA is a streamlined diesel passenger locomotive built by the American Locomotive Company with General Electric from 1946 to 1953, selling in the hundreds against EMD's thousands.
ALCO RS series
The ALCO RS series was a family of four-axle diesel-electric road switcher locomotives built by ALCO and its Canadian affiliate Montreal Locomotive Works from 1941 into the 1960s.
ALCO S-2 and S-4
The ALCO S-2 and S-4 were 1,000 horsepower diesel-electric switcher locomotives built by the American Locomotive Company and Montreal Locomotive Works from 1940 to 1961.
Alstom
Alstom SA, formed in 1928 as Alsthom, is a French rail company that builds trains, metros, and signaling systems including the TGV, and acquired Bombardier Transportation in 2021.
Alstom Citadis
The Alstom Citadis is a family of modular low-floor trams built by Alstom, first entering service in 2000 and now running in over 140 cities worldwide.
Alstom Coradia LINT
The Alstom Coradia LINT is a family of diesel multiple-unit regional trains built by Alstom in Germany since 1999, in versions named for their length in meters.
Altamont Corridor Express
The Altamont Corridor Express (ACE), formerly the Altamont Commuter Express, is a commuter rail service connecting Stockton with San Jose over Altamont Pass, running weekdays since 1998.
Alto (high-speed rail)
Alto is a proposed 218-mile high-speed railway connecting Toronto and Québec City, Canada, running in the Interstate 15 median and designed for all-electric trains reaching 200 mph.
American Locomotive Company
The American Locomotive Company, commonly known as ALCO, was an American locomotive manufacturer based in Schenectady, New York. Formed in 1901, it was the second largest steam locomotive builder in the United States.
American Public Transportation Association
The American Public Transportation Association (APTA) is a nonprofit association of more than 1,500 member organizations representing the public transportation industry in the United States and Canada, founded in 1882.
American Railway Engineering and Maintenance-of-Way Association
The American Railway Engineering and Maintenance-of-Way Association (AREMA) is a North American professional association for railway engineering, formed in 1997 and publishing the Manual for Railway Engineering.
Amfleet
Amfleet, also known as Amcans, is a fleet of stainless-steel intercity railroad cars built by the Budd Company for Amtrak, derived from the Metroliner car design.
Amtrak
Amtrak, formally the National Railroad Passenger Corporation, is a for-profit corporation created by Congress in 1971 to operate intercity passenger rail in 46 states, including Acela high-speed service in the Northeast.
Amtrak Airo
Amtrak Airo is a fleet of 83 intercity trainsets built by Siemens Mobility for Amtrak, replacing 1960s and 1970s equipment; the first entered service on Amtrak Cascades in 2026.
Amtrak Cascades
Amtrak Cascades is a state-supported intercity passenger rail service running along the I-5 corridor from Vancouver, British Columbia, through Seattle and Portland to Eugene, Oregon, launched in 1994.