L-R: BM 1132 SW-1, BM 1170 S-1, BM 1122 SW-1 seen here at north end of yard. 100 ton switchers were the rule at Nashua due to light rail in yard and industrial trackage, and bridge restrictions on the Hillsboro Branch.

Photographed by Bruce Nelson, November 22, 1972.
Added to the photo archive by Bruce Nelson, August 19, 2017.
Railroad: Boston & Maine.

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