The new Athearn engine is accurate, except they do not include the front snow plow or MU hoses. See my web page.
http://home.swbell.net/alykka/public_html/MInuteMan'sB&MPage.html
I'm adding LEDs and a DCC decoder to mine now...
See the B&M Modeller Yahoo group for pics on installation that I am making....
http://ph.groups.yahoo.com/group/BandMModeler/photos
Join the Group...good resource!
So is the B&M Yahoo group here:
http://finance.groups.yahoo.com/group/BM_RR/messages