In rec.crafts.metalworking,
Martin Eastburn wrote:
That is a 'Monster' - it is longer than normal and has a
'ventilated' rear power unit. Looks like the repair shop
took a unit that smashed up the cab but had a good generator
and made a monster for long coal cars or heavy loads.

Looks like it is spelled right on the other side.

https://www.youtube.com/watch?v=LwlzUmBlIB8

It is on screen starting at 20s to 34s.

And it's correct he

http://www.rrpicturearchives.net/sho...aspx?id=558546
Date: 11/4/2006 Location: Hot Springs (subdivision), UT

Also correct he

http://www.rrpicturearchives.net/sho...spx?id=1227799
Date: 7/1/2008 Location: Railroad/Marshall, El Paso, TX

I can't find any other photos newer than last year and all
of them seem to have it right. I suspect a repair with painted
siding that didn't match.

Elijah
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or photoshop