gunrunnerjohn posted:That smoke unit happens to be an O-gauge model for small locomotives, but it obviously will work. The benefit of the ran driven smoke unit, other than the fact you get reliable smoke, is that they don't get nearly as hot. I haven't had to take any extraordinary measures to manage heat using one, unless the fan stops, I can't imagine it getting how enough to deform plastic, even right next to it.
BTW, the video doesn't work.
You're right. It's from an O-gauge Alco S-2 switcher. Here's a pic showing it (top) along with the HO smoke unit (bottom) from your posting: https://ogrforum.ogaugerr.com/t...oke-unit-for-o-guage
I couldn't find a PDF exploded parts view for the S-2 on the MTH site but the smoke unit is AA-2100002, $40. What's not clear is there's a brass cup / nozzle that must be ordered separately (if you want it). The part number might be AA-2100008, $3.50 but there's no picture of it on the MTH parts ordering page and the dimensions they give don't exactly match what I have. 
Anyway, I found it easy to heat-shrink over the brass cup to make a relatively air-tight seal.
I thought I knew how to post video, but I guess not. I inserted a link to the youtube video in the original post.
