Denver International Airport underground people mover tunnels

Denver International Airport (DIA) includes an underground Automated Guideway Transit System that runs in tunnels connecting the Jeppesen Terminal to Concourses A, B and C. The airport opened in 1995 and the underground train/people-mover has operated since the airport began service, carrying ticketed passengers between terminal and concourses through subterranean passages. The tunnels and platforms are part of DIA’s below-ground transit infrastructure.