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Freight Car Brake Adjustment
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I worked in a freight car running repair shop around 1960, and all freight cars were equipped with manual slack adjusters on both ends of the car. Automatic slack adjusters were just beginning to appear. Manual slack adjusters had been in use for many years, and were used, as noted, to keep piston travel within prescribed limits. <br /> <br />The air braking system of a freight car was based on equalization of pressure with a maximum piston travel of six inches. Less piston travel resulted in higher braking force; more travel in less braking force. The arbitrary figure was seen as a compromise - enough to provide adquate braking for a loaded car, but not enough to slide the wheels of an empty. <br /> <br />Old Timer
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