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To meet the need for reliable railcars to haul aggregate, crushed rock and gravel, Greenbrier has designed the Dura-Max™, a 2,400 cubic feet open-top hopper railcar. With input from aggregate shippers, the Dura-Max™ has a 286,000 lbs. gross rail limit and transverse doors operated by a single-cylinder per set of doors for individual door control. Our steel body design provides superior strength and durability throughout the life of the railcar.