Based on a 1950's drawing from the Rocky Mopuntain Railroad, this mine head will fit many model railroads to create revenue and interest. The kit is a combination of laser cut wood and board on board aseembly. This kit is loaded with fixtures to speed assembly of the head frame and the tipple. The kit includes the tipple, head frame, hoist house, bull wheel at the top of the head frame and the lift car. The hopper/gon is not included but is available as our gondola conversion #T-2090 or T-2091to fit a Bachmann On30 flat car. The S scale and HO scale kits are exactly the same with only a few minor design differences. The foot print for the O version is 16" wide by 5" deep. the S is 12" wide by 4" deep and the HO is 8" wide by 2 1/2" deep. And to top it all off we've been able to maintain pre summer 2008 prices on the materials. To say this kit is a bargain is an understatement!!!