A view looking looking out of the outbound side of Airport Station. At Airport Station, Blue Line trains heading outbound switch from using third rail power to overhead power drawn through pantographs on the subway cars. Inbound trains do the opposite and switch from overhead power to third rail power. This location is also where Blue Line trains descend below ground heading inbound, and come to ground level when heading outbound.
Photo taken: June 4, 2017. Boston, Massachusetts.
Photo © Tom Gatermann