All the big railroads use interlocking towers to route trains. This slightly smaller kit will fit any layout. There are many kits of this type, but this one is very typical of many around the country. I bashed mine to be the SP's Elvas Tower in Sacramento. The wood kit is very simple with easy to apply doors & windows. I substituted the upper story walls with all windows (Also avail. from AMB) and added an extra door to the front to match Elvas Tower. A little pepper in the paint for the Stucco look and a few pieces of interior really made this come alive. A very fun 1 day project!