First of all, SPUI, thank you for this map, and for all your other contributions to Wikipedia. They're much appreciated.
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Unfortunately, I am away from my copy of the National Timetable for the holidays and cannot answer this question myself: are there no more through-routed Regional trains to Boston via the Inland Route? I know they existed as recently as a year ago, but don't remember hearing that they were removed from the schedule.
Thanks,
M. Noda