The following is my latest project; the locomotive is an HO scale BLI Blue Line Big Boy retrofitted with a QSI Revolution-U Sound decoder and and an MTH after market fan/smoke unit. Here’s a short vid:
http://www.youtube.com/watch?v=Aftqf2KYBVY&feature=feedu
I’ve already tried to place the MTH smoke unit in my PCM Y6-b locomotives and sadly there is not enough room. Hopefully, BLI will make available for purchase its smoke units as after market parts.
I’ve got three more MTH units that should fit my PRR J-1 and possibly my M1-a or N&W Class A locomotives. I think I’ll try the Class A first.