This orange scale test car has black lettering and runs on black trucks. Since the railroads' revenues were dependent on the correct measurement of loaded cars, great emphasis was placed on proper maintenance of the scales. Charged with the responsibility of keeping all the track, truck, baggage and freight scales on their respective lines in perfect condition, the scale inspector’s arrival was often preceded by the appearance of the small scale test car. The scale test cars were always to be hauled just in front of the caboose. Immediately upon arrival at the terminal, they were set aside and subjected to a minimum of switching. Under no circumstances were they to be used in switching other cars in the train.