Mike Brock wrote: Thus, if I choose to comment about the obvious fact that UP was the most advanced railroad regarding frt cars during the steam era [ <g> ] I am permitted to do such. Well, they certainly knew how to convert a rather standard box car into one that would be difficult to model accurately 60 years in the future without resorting to resin (alternate center riveting). Conspiracy? Perhaps the engineers were intent on creating future X-Files fodder. What was the purpose of ACR anyway? Did the UP have additional bracing in the car and if so for what purpose? Kevin Lafferty Modeling the UP in '53.