William Horsfield, 45, groped one woman, rubbed the legs of another under the table, while another was followed after getting off the train to get away from him.

He targeted the women, two of whom were in their teens, as they travelled alone on journeys between North Walsham, Sheringham and Norwich.

Norwich Magistrates' Court was told on each occasion he wore sunglasses which the women believed was to disguise him eyeing them up.

His creepy behaviour also included asking quiz questions, telling one woman who got an answer wrong: “Naughty, I’m going to have to spank your bum.”

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