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Acela Express
The ''Acela Express'' ( ; colloquially abbreviated to ''Acela'') is Amtrak's high-speed rail service along the Northeast Corridor (NEC) in the Northeast United States between Washington, D.C., and Boston via 14 intermediate stops including Baltimore, Philadelphia, and New York City. Acela Express trains are the fastest trainsets in the Americas; the highest speed they attain is in revenue service.〔 Acela trains use tilting technology, which helps control lateral centrifugal forces, allowing the train to travel at higher speeds on the sharply curved NEC without disturbing passengers.〔
Unlike the Japanese Shinkansen, the French TGV, the Spanish AVE, and the Chinese CRH, Acela shares tracks with commuter and freight trains. However, aging infrastructure in many segments of NEC limits the train to an average speed in regular service considerably lower than its maximum speed.
Between Boston and Washington, Acela covers in 7 hours,〔 an average speed of . Amtrak has a long-term plan that would reduce travel time to 3 hours by the year 2040, reaching speeds of up to , primarily by acquiring more modern trains and reducing or eliminating congestion with other trains on the NEC. Acela helped Amtrak capture a 75% share of air/train commuters between New York and Washington in 2011, up from 37% in 2000.〔Goldberg, Bruce. "Metroliner's Amazing Rave." ''Trains'' June 2006 (53)〕 Due to this competition, some airlines have even canceled service between Washington and New York. Between New York and Boston, the ''Acela Express'' has up to a 54% share of the combined train and air market.〔 ''for Acela express passenger numbers only'' 〕
The ''Acela'' carried more than 3.3 million passengers in fiscal year 2013; second only to the somewhat slower and cheaper ''Northeast Regional'', which had over 8 million passengers in FY 2013.〔 The ''Acela Express'' had a total revenue of $530,820,821 in FY2013,〔 up from $409,251,483 in 2009. The Acelas accounted for approximately 25% of all total revenue generated by Amtrak services. (Another 25% came from Northeast Regional traffic, and roughly 25% each for long-distance trains and state-supported corridor services throughout the rest of the country).〔
==Origins and history==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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