Atlas 20007176 Master HO ACF 3-Bay Cylindrical Hopper, CEMEX Mexico #62215Atlas 20007176 Master HO ACF 3 Bay Cylindrical Hopper, CEMEX Mexico #62215 Atlas Item #: 20007176 Introduced in 1961 by ACF to haul sand, clay, salt, grain and bulk plastics, the Cylindrical Hopper was the first commercially successful tank type covered hopper car design. A few of the more than 4,000 cars of this type built through 1966 can still be seen in service today across the United States. Features: See through roof walks Blackened metal wheels