WR-2 eastbound on the Worcester Main Line with BM 1708, 1715, 1714, 1566, 1576. This is the Saturday routine: The weekday local engines (GP-7's) will be set off at Ayer to go to Boston or East Deerfield for servicing (don't remember which) and the "pigs" on the head end, mostly empty trailers also will be set off at Ayer to go home west.

Photographed by Bruce Nelson, July 13, 1974.
Added to the photo archive by Bruce Nelson, October 5, 2016.
Railroad: Boston & Maine.

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