The Gatwick Airport Shuttle Transit is a 0.75 miles (1.21 km) long elevated automated people mover that links the North and South Terminals at London's Gatwick Airport. The line is ground-side, and besides linking the two terminals also serves to link the North terminal to the airport railway station. Although sometimes colloquially, but erroneously, known as a "monorail", the transit vehicles are carried on rubber tyres running on a concrete track with twin running surfaces and are steered by separate guide rails.