There is a fully automated "Train" that runs between the North and South Terminals at Gatwick Airport. The north terminal was opened in 1988, so presumably the train was designed well before that.
Work began on a second terminal in 1983. Her Majesty The Queen and The Duke of Edinburgh inaugurated the £200 million Gatwick Airport North Terminal in 1988.
and from http://en.wikipedia.org/wiki/London_Gatwick_Airport
Gatwick Airport Transit
The Gatwick Airport Transit provides free transportation between the North and South Terminals. The transit system uses transit vehicles that run along a 1.2km long elevated two-way track system. The transit vehicles are automatic driverless people movers each with three cars.
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