Aux. power unit.  Contributor's Pick!       
This unit can be used to move the locomotive when it's light and thereby save fuel.
Date: 7/11/2014 Location: Lorain, OH Views: 69 Collection Of:   Fred Stuckmann
Author:  Fred Stuckmann
Aux. power unit.
Picture Categories: This picture is part of album:  Ohio Locomotive works July.
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