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The RUF system is electric and a ruf has to be able to drive at least 50 km on its own small batteries. It could also be driven by fuel cells or contain a hybrid engine.

Unlike normal electric cars, a ruf has potentially unlimited range, since it receives power from the guideway. It can recharge batteries while on the guideway.

In rare cases where a battery driven ruf has to drive more than 50 km away from the rail network, it is possible to mount a hybrid-unit in the empty slot beneath the ruf. It contains a small engine running at constant speed, optimized for low pollution, low noise and high efficiency. It drives a generator which produces power for the propulsion of the ruf. By means of this unit, a ruf can drive anywhere, just as a normal car.

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