Loading ...I spent a year in a small town in Switzerland ( Yverdon , Canton of Vaud ) in the early 1960’s . They had a bus service which ran about a 5 km. circuit around town . Just one small bus – maybe 20-25 passengers which had a charging station ( or maybe two , one at each terminus ?) where the flywheel would be spun up ( magnetically ?) with enough energy to complete the circuit , by parking over the charging pad – no wires . I am assuming the flywheel was mounted beneath the floor , horizontally , to avoid the gyroscopic effect when turning left and right . As I recall , it would spin up ( recharge the flywheel ) for about 15 minutes of each circuit .
Silent , clean , and fairly effective for that limited service .