A new airport rail network has started operations at Dulles International Airport in Virginia, US.
Planning for the $1.5bn train system began 15 years ago and the completed project covers four miles of track at speeds of 42mph and features 29 electric rail cars that can accommodate 50 passengers.
The train, known as AeroTrain, runs from the airport's baggage claim area to its main passenger terminals and boarding gates A, B and C.
The train does not serve gate D or the international arrivals terminal.
AeroTrain is part of a $3bn expansion launched a decade ago that includes building a fourth runway, parking garages and 15 new gates and concourse and terminal expansions.
The AeroTrain system replaces most of the current diesel-fuelled Mobile Lounge system, although half the 49 mobile lounges will stay in service.
The airport is expected to have a Metrorail station by 2016 when the Silver Line is extended from East Falls Church to the airport and into Loudoun County.