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AAA Sales & Engineering is an OEM supplier of pneumatic and electro-hydraulic ISO-approved railroad retarders. The company says all of its designs are created to ensure that the braking force applied to the car wheels remains controllable as the car passes through the retarder. This controllability reduces the high concentration of force on the car wheel, which may cause light cars to be lifted, the company says, adding that guide rails provide an added precatution against derailment.