When you're busy doing something, there's always a critic. Tim Buckley, machinist, and sometimes "sidewalk superintendant" points out some dirt on the flanks of GP-18 904 at Boston Engine Terminal.

Photographed by David S.Hutchinson, January 29, 2011.
Added to the photo archive by David Hutchinson, January 30, 2011.
Railroad: MBTA.

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