N Scale Class B, 26 Ton Shay. This is a 2 truck Shay and the kit includes parts to make a wood, oil, or coal fueled engine. Nn3 wheelsets are required to complete. A transition log car is included which requires Z scale trucks - one with coupler and one without. The detail parts are grouped together on a sprue. Please contact me if you have any questions. A Powered version of this Shay is available at the imageReplicas website: http://archimagestudios.us/nn3.html