This Bachmann HO Scale Silver Series 40′ Quad Hopper is based on cars used in the steam and classic-diesel eras. Quad, or 4-bay, hoppers hauled everything from coal to crushed stone and other aggregates. Later in their life, some cars were transitioned into maintenance-of-way use, further extending their usefulness. Today, examples can typically be found in museums and operating on photo freights with tourist railroads. The 40′ Quad Hopper features an injection-molded body, finely applied decoration, blackened metal wheels for operation on Code 70 and larger rail and E-Z Mate(R) magnetic knuckle couplers. The 40′ Quad Hopper is part of the extensive line of Bachmann HO Scale freight cars.WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov