Rapido HO Scale X-3 Tank Cars
The X-3 cars were built in various capacities and configurations, including 6,500 gallon, 8,000 gallon and 12,000 gallon tanks. They were also built with single, double and triple domes. However, none of these variants were more numerous than the basic 10,000 gallon, single-dome version. From the 1920s onwards Union Tank Car (UTLX) fielded the largest fleet of tank cars in North America, and the 10,000 gallon X-3 accounted for nearly 13,000 of them!