All Solingen trolleybuses had an auxiliary engine, also the first trolleybuses, delivered 1952. They had an VW-motor with 25 PS (14 kW), the MAN has also a VW-motor, but 27 kW. The new articulated trolleybuses (Berkhof and VanHool) have a diesel-engine with 80 kW. The MAN is 12 m long, the 3x are neceassary to carry more people and it is better in snow-days.
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