The Airport Rail Link (ARL) (Thai: รถไฟฟ้าแอร์พอร์ต เรล ลิงก์) is an airport rail link line in Bangkok Metropolitan Region connecting Suvarnabhumi Airport to the city center. The commuter rail line starts at Suvarnabhumi station underneath the airport terminal, before ascending onto an elevated viaduct to Lat Krabang station where it meets the eastern line railway station of the same name. (Each Airport Rail Link station, except Suvarnabhumi and Ratchaprarop stations, is located above an eastern line railway station.) The line continues west, directly running above the eastern line railway for the rest of the line. It runs towards Ban Thap Chang station, then towards Hua Mak station where it meets Yellow Line, then towards Ramkhamhaeng station, then towards Makkasan station where it meets Blue Line, then towards Ratchaprarop station, then towards Phaya Thai station where the line terminates and meets Sukhumvit Line. It is owned by State Railway of Thailand (SRT) and, since 2021, operated by Asia Era One Company Limited. The 28.6-kilometer (17.8 mi)-long Airport Rail Link opened for service on 23 August 2010.
In the future, Airport Rail Link will extend from Phaya Thai towards Krung Thep Aphiwat Central Terminal and Don Mueang International Airport. Its rail will also be used for the proposed Don Mueang–Suvarnabhumi–U-Tapao high-speed railway.
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