From Don Curtis #1

As you can see Concello's seat wagons were spotted heading in toward the rings and once the sides were unfolded upward and the front ends of the vehicle lowered, they made a dressing area right beneath the public all around the tent. Feature acts had private dressing rooms as indicated by the steps going up into the back end of the seat wagon (high and dry) and side wall was hung between the wagons for everyone else. The only thing wrong with this this arrangement was it was unbearably hot with no ventilation and rather than a neat profile of the Big Top, you got this tenament apartment effect. The performers of course lived on the train at night.