Posted by J. Wheeler on March 1, 2010 
Steven, any idea what that second unit is? I don't see any fans on top.
Posted by Mike Mautner on March 1, 2010 
It is a slug rebuilt from an SD40 .
Posted by steam_marc on December 2, 2010 
Mike: it's technically a slug; it has no traction motors. It just has the loco brakes enabled, to help with stopping.
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