Online, I found several different versions of the Ringling Bros. Barnum and Bailey Red Unit stock cars. I chose to model the Red Unit. Currently, the circus maintains two circus train-based shows, the Blue Tour and the Red Tour, as well as the truck-based Gold Tour (which began in 2004). Each train is a mile long with roughly 60 cars: 40 passenger cars and 20 freight. Rolling stock belonging to the circus bears the reporting mark "RBBX". The Blue and Red Tours present a full three-ring production for two years each (taking the month of December off), visiting alternating major cities each year. Each train presents a different "edition" of the show, using a numbering scheme that dates back to circus origins in 1871— the first year of P.T. Barnum's show. The Blue Tour presents the even-numbered editions on a two-year tour (beginning each even-numbered year), and the Red Tour presents the odd-numbered editions on the same two-year tour (beginning each odd-numbered year). The Gold Tour presents a scaled-back, single-ring version of the show, designed to serve smaller markets deemed incapable of supporting the three-ring versions.