it does have 4 holes on the bottom, and metal clips.  I looked up some other vintage Athearn stuff and motor/gearing look the same.

thanks for the help,
Scott

I bought this on EBAY assuming it was a Bachmann as described.  It has no markings what so ever but it is a nice piece, did Bachmann make locos with out their logo on them?  Who could have made this?

http://www.ebay.com/itm/Used-Bachmann-Santa-Fe-Red-Silver-Diesel-Engine-74-HO-Gauge-/121098389041?nma=true&si=libLmQ%252BbTscGKzaBFLt4jr4bAyg%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557#ht_38wt_1141

Thanks for looking,
Scott