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Clue 5: This station is the same number of stops away from the principal terminus served on its route as another, identically-named station in a different British urban area is from its principal terminus.
is correct - although I'm going to get hit for 6 for clue 5, since I got my London stations in the wrong order (QPW has 2 intermediate stops between it and London Euston, whereas QPK has only 1 stop between it and Glasgow Central).
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