Check out this car builder's website: http://johnstownamerica.com/index.htm Many of these cars are now being made in N scale by the LBF Co. in Oregon. Check out their website here: http://www.lbfcompany.com/products.htm LBF dealers include BLW http://blwnscale.com Rio Grande Hobbies http://4nscale.com eNjoy
That slab car looks like an Alan Curtis project if I ever saw one! Hey Alan, they even printed the prototype dimensions on the website! They are almost begging you to do it.
