Don't mean to hi-jack the post. But someone asked if it is possible to add a smoke unit to the Bachmann On30 Locos. Here is a crude video of a Bachman HO 3-Truck Shay that I kit bashed using a On30 Kit and added a smoke unit. Sorry for the bad video, it's a few years old. I have also added smoke units to Backmann On30 Climaxes. You do need to change the stock smokestack.