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Once you narrowed it to Scotland I knew it was Springfield, Golf Street & Barry Links which would see a 170, and the latter two are served from GLQ.
Moving on.
Clue 1: This service runs from a terminus.
Clue 2: it arrives at a through station.
Clue 3: Give or take a couple of minutes the journey is 60 minutes.
Clue 4: The same two TOCs serve both ends of this journey.
Clue 8: All stations called at, with the exception of the destination, are within 2 miles of the high tide line. And the exception is by less than 100 yards.
1) The origin station is within 1km of the high water mark
2) This service involves a reversal
3) The headcode on this service starts with a 1 (e.g. 1E12)
4) The destination station has a direct service to Scotland's 2 largest cities
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