PrairieLocoWorksLLC@amayajmz Thank you for your interest. This is an add on kit to convert the Atlas N Scale Shay into an HO Scale on running on 30 Inch Gauge (N gauge) track. If you do not have an Atlas N Scale Shay, this kit will be of little use to you, though it is likely another mechanism can be adapted. The spreading out of the parts allows many options in cabs, stacks, headlights, and bunkers. If you download the instructions you will be better able to consider if this a product for you.