which Con-Cor SW7 ?
the Athearn powered one ?
or the Kato Powered one ?
the body is a 1956 Revell casting which has some U.P. specific details on
some versions-the top mounted number boards,the end ladders to the
top of the hood.matched the U.P. Cajon Pass Pushers,but didn't have the
Dynamic Brakes,which were later removed.and front tool box,that some
other roads also had.
the Kato drive unit was also used in the SW1500 and to this day is the only
Kato motored unit that runs HOT,really HOT here.
if You can get the Kato drive cheap,go for it.
Athearn drive should be even cheaper as they need standard Athearn BB
Up-Grades to get a decent running unit.
Spikre