BM 1567 GP-7, BM 4227 F-3B, BM 1568 GP-7 on WR-2 eastbound through Ayer Interlocking. Check out the pipe along the track that was used to handle air from the compressor at Ayer Tower to operate the pneumatic power switches.

Photographed by Bruce Nelson, February 24, 1972.
Added to the photo archive by Bruce Nelson, July 24, 2017.
Railroad: Boston & Maine.

Bruce Nelson's awards:

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