Waltham, MABM 1280 S-5(m) (S-5 upgrade with turbo charger boosting HP from 800 to 1000). Ready to leave yard and go down the Bemis Branch. Note trainman at phone box calling for signal. That's how it was done before radios.
Photographed by Bruce Nelson, January 27, 1972.
Added to the photo archive by Bruce Nelson, June 25, 2017.
Railroad: Boston & Maine.
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