I am researching 1950s boxcars for use on the recently released Sherman Hill 1950s route. I seem to remember that way back in 2011 Michael Stephan released a a pack of 18 USRA 40' boxcars which included single-sheated boxcars.
As far as I can make out this pack is no longer available, but I wonder if these single sheated boxcars are still somewhere available. Sherman Hill 1950 is a truly wonderful route, and such cars would look good (with other 40ft boxcars) behind UP steam…
Marcus