Armed only with a compass and a map of Britain's rainways, you must end up at the right section with a valid ticket.
Advertised in Computer & Video Games, issue 26, December 1983, p. 118 and featured in Micro Adventurer, issue 3, January 1984, p. 7, as part of a six-game line-up with a £10,000 prize. There's no evidence of the game actually existing.
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WoS describes this as a text adventure, but I'm not sure that it sounds like one.