AY-4 headed back east on the Watertown Br. at the Cambridge Water Works speed trap. Note: the water is relatively low in this photo. Late winter and early spring it's usually a few inches over the rail.

Photographed by David W. Grimm, May 16, 2003.
Added to the photo archive by David Grimm, July 18, 2003.
Railroad: Guilford (B&M).

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