This guy specializes in upgrades. He also sells coreless motors. I have bought from him and had him custom fit a gear motor to a worm for HO CP Huntington loco.
http://www.micro-loco-motion.com/canmotors.html
He also sells on ebay. Search ebay for can motors. You did not say if you have ever done this before. If not, take time to review the NWSL site. http://www.nwsl.com/
Some years ago I bought the NWSL catalog with a lot of good info, tools, motors, gear planning info.
With Google, search for brass locomotive upgrade as an example.
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
drrobI am collecting some older brass steam engines and would like to repower the older ones with can motors and eventually upgrade all of them to DCC. Where are good web sites/articles for this adventure? Thanks
Try Mark Schutzer's website: http://markschutzer.com/
This also might be useful: http://www.geocities.com/budb3/arts/rpwr/rpxmp.html
Andre