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The Mercersburg Railroad was a short line formed in the late 1970's to operate the former Cumberland Valley branch from Mercersburg to Leymasters, PA.  The line was short lived and the tracks are now long gone.  Two S-2's provided power when the railroad was in operation.
 

MERW No. 1 with some borrowed Gettysburg Railroad coaches after an excursion in 1978.

MERW No. 2 at Leymasters