SEA Underground
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The SEA Underground, formerly called the Satellite Transit System, is an automated people mover system operating in the Seattle–Tacoma International Airport in SeaTac, Washington, United States. Originally opening in 1973, the SEA Underground is... Wikipedia
Line length: 1.67 mi (2.69 km)
Opened: July 1973
Operating speed: 27 mph (43 km/h)
Ridership: 16 million (2015)
Rolling stock: 21 Innovia APM 100 vehicles