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Air Brakes and Train Handling Rules - Alaska Railroad

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67 Car Equipment <strong>and</strong> ComponentsSLOW DIRECT EXHAUST (SD). Exhausts brake cylinderpressure for a blowdown time of approximately 86 seconds <strong>and</strong>continues to exhaust until all pressure is vented. H<strong>and</strong>le is45 degrees above horizontal.67.11.2 Four-Position Retaining ValveThe four-position retaining valve includes these positions:DIRECT EXHAUST (EX). Exhausts all brake cylinder pressure.H<strong>and</strong>le is turned down.HIGH PRESSURE (HP). Exhausts brake cylinder pressure to20 psi. H<strong>and</strong>le is 45 degrees below horizontal.LOW PRESSURE (LP). Exhausts brake cylinder pressure to 10psi. H<strong>and</strong>le is horizontal.SLOW DIRECT EXHAUST (SD). Exhausts brake cylinder pressureover a blowdown time of approximately 86 seconds, <strong>and</strong>continues to exhaust until all pressure is vented. H<strong>and</strong>le is 45degrees above horizontal.67.12 Empty/Load Equipment67.12.1 Description Of Empty/Load EquipmentEmpty/load equipment is two-step equipment that provides distinctlydifferent braking characteristics for empty or loaded cars. Brakingforces for empty cars are usually 35 to 60 percent of that providedfor loaded cars.This equipment is usually employed on cars h<strong>and</strong>ling specific lading.The cars are either empty or heavily loaded. Empty/load equipmentallows enough stopping force when the cars are loaded, but it doesnot allow braking levels that could slide wheels on empty cars.67-12 ARRC <strong>Air</strong> <strong>Brakes</strong> <strong>and</strong> <strong>Train</strong> H<strong>and</strong>ling Manual June 1, 1996

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