Stripping paint off locomotive shell?

[FCIN]

Friend of mine uses 91% alcohol with great results on most manufacturers models. Only thing that it wouldn't work on was a BLI NW-2 that he painted for me a couple of weeks ago. He has successfully stripped the paint off Atlas, Kato and Athearn loco's and cars. I've got some Athearn/Roundhouse cars that need new paint jobs and will try it myself.