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TrinityRail offers a complete line of Rapid Discharge® hopper cars including the RDL™, a 4,323-cubic-foot, longitudinal discharge aluminum coal car. The simple, efficient and adjustable door system promotes increased capacity over traditional automatic discharge and standard hoppers, the company says. The system is designed to help maintain a positive seal to mitigate coal dust leakage while providing quick and efficient unloading. Replacement components, field service support, and leasing and management options are available.