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union pacific air brakes exam with correct answers 2026/2027
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union pacific air brakes exam with correct answers 2026/2027 what % of operative brake equipment must trains have under all circumstances? 85% what is the air pressure regulating valve or "brake pipe" pressure set to for yard and freight service? 90% when an air brake test requires an inspection to determine that the brakes apply and release on the rear car of the train, what action would fulfill this requirement? 5 pound increase and a 5 pound decrease what is the initial method to test brake pipe leakage? air flow method the brake system for freight trains must be charged to a minimum requirement of at least ______PSI at the REAR before an air test can begin.
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