When I was in my other house I had a static train layout running on a H.O. track. H.O. is too small for 25/28mm, so what I did is rebuild these two cars out of cardboard on top of the H.O. cars. The addition of the cardboard made the cars bigger...wider and taller and closer to S scale , which is where this has to be. The bottom of the cars is set up for H.O. which will change to S scale to run on a wider track. Finding an S scale Civil War train will not be easy, but this is a start. The flatcar is transporting a siege gun and gun powder.