1968-75 General Motors Rapid Transit Experimental (RTX)
(Truck & Coach Division)
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Notes: In 1969, GM Truck & Coach unveiled a sleek, radically different designed experimental prototype bus it named the Rapid Transit Experimental (RTX). This three-axle, fiberglass-paneled, low-floor spaceship looking vehicle, built in 1968, was envisioned by General Motors Truck & Coach to be its "bus of the future." Production of the RTX dates as early as 1964. The RTX would be GMC's entry in the U.S. Department of Transportation's "Transbus" project. Wanting a backup plan in the case that the Transbus project was abandoned, GMC decided to modify the RTX/Transbus design and in 1970 work began on a new modified RTX prototype known as the "RTX + 9", which would evolve into what General Motors would later call its "Rapid Transit Series" coach.
