Denver International Airport automated people mover tunnels

Denver International Airport's automated people mover (APM) operates in tunnels and guideways beneath the airfield and terminal to link the Jeppesen Terminal with Concourses A, B, and C. The tunnels separate passenger transit from aircraft operations and are used exclusively by the airport's electric automated trains. Passengers access the concourses by riding the APM through these enclosed tunnels; the tunnels themselves are not open for general pedestrian access.