Air Brakes and Train Handling Rules - Alaska Railroad

64 Train Handling• Empty cars—LP (low pressure) or SD (slow directexhaust) positionNOTE: The normal position for retaining valves is theEX (direct exhaust) position.64.13 Helper OperationsTo prepare and operate helper locomotives used in the mid or rearportion of a freight train, follow these guidelines:64.13.1 Testing and Coupling Helper LocomotivesFollow these steps to test and couple helper lines:1. To adjust and test the helper’s air brake system:a. Adjust the regulating valve to 10 psi below the prescribedbrake pipe pressure for the train being assisted.b. Perform the required air brake test.2. To couple the helper:a. Make sure that all helper locomotives have alignment controlcouplers or bolster stops.b. Couple the brake pipe hose and cut the air in on the helperlocomotive.c. Make sure that the helper locomotive is not cut off while thetrain is moving.64.13.2 Adding Helper Locomotives To Other ThanHead EndTo prevent an unintentional brake release on the train being assisted,make the following changes on the helper locomotive after couplingthe helper but before opening the angle cocks:1. Make an automatic brake pipe reduction to the same pressure asthe rear brake pipe pressure of the train being assisted.NOTE: If the train’s rear brake pipe pressure is not known,make a 10 psi brake pipe reduction.June 1, 1996 ARRC Air Brakes and Train Handling Manual 64-37