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But the Gyrobus was heavy, and its range was limited to a few kilometers, so it never reached mass production.
Several teams in Europe and the United States--including the one at Austin--have recently proposed modern analogs of the Gyrobus.
In the late 1940s, Swiss researchers built a flywheel-equipped electric-powered trnsit bus called the Gyrobus, which was used in urban passenger service over hilly terrain.