Rob,
I don't have the tools or talents to make those custom circus wagons and side rails for use with my Standard Gauge 211 flatcars. Dave Anderson does. I approached him about making some custom wagons for placement on my 211 flatcars after purchasing several of his 1/24 G scale circus wagons on ebay. Unfortunately, these proved too wide and long to mount two on a 211 flatcar. So I contacted Dave and asked him if he could downsize them until two would fit. He said he would try.
So I shipped him a 211 flatcar, and after some experimentation, Dave found that two of his circus wagons in 1/32 scale would work. He even allowed me to pick out which Ringling Bros and Barnum & Bailey Circus banners I wanted him to use on the sides of the circus wagons, and much to my pleasure, on his own initiative he produced the striking side rails.
As you can plainly see in the pictures above, the results of Dave's efforts are fantastic. I liked them so much that I subsequently asked Dave to make me several sets of Buffalo Bill wagons for use in a special Buffalo Bill's Wild West Show train I wanted to create. You will be able to see this unique train in action at Trainfest 2017.
Bob Nelson
PS. See my Ringling Bros. circus train running on the SGMA layout at Trainfest 2014 here:
https://www.youtube.com/watch?v=x7DIBFLi1zo
PSS. Using the below link, see my initial Buffalo Bill's Wild West Show train running on the SGMA layout at Trainfest 2015. Since this video was taken, Dave has produced several more Buffalo Bill wagons for me which I mounted on additional MTH 211 flatcars. These will be on display at Trainfest 2017.
https://www.youtube.com/watch?v=_3D7JxGQUe4