Shell Chemical Company Road Numbers SCMX 651 / 652 These three dome tank cars are painted orange and black with black herald and lettering. Built in October 1941, they run on Bettendorf trucks. While the single dome tankers were generally intended to carry a large quantity of a single commodity, the three dome tankers were designed to carry smaller quantities of multiple products such as motor oil, gasoline or chemicals. ACF began producing these cars in