Until the 1968 Transport Act changed everything, vehicles were put into alphabetical groups for driving licence purposes, Diesel buses and lorries were heavy motor cars but a trolleybus was classed as a light locomotive. Passing a driving test in a trolleybus would not licence the holder to drive any other vehicle, except perhaps an electric milk float. Buses, coaches and fire engines required an additional PSV licence (public service vehicle) but oddly, I believe, trolleybus drivers didn’t need a PSV.
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