Air Brakes and Train Handling Rules - Alaska Railroad
Air Brakes and Train Handling Rules - Alaska Railroad Air Brakes and Train Handling Rules - Alaska Railroad
64 Train Handling64.11.6 Slowing or Controlling Speed—ThrottleModulation MethodFollow these steps when slowing or controlling speed using thethrottle modulation method:SagCrestThrottle ReductionThrottle ModulationDirection of Travel0.50% -0.50%0.50%When slowing or controlling speed approaching a sag:1. As you approach the sag, reduce the throttle as necessary tocontrol train speed.2. Reduce the throttle further as the head end of the train beginsdescending.3. Just before the head end of the train reaches the ascending grade,increase the throttle.4. Continue to increase the throttle as the train ascends the grade.5. Reduce the throttle as the rear end of the train approaches theascending grade.June 1, 1996 ARRC Air Brakes and Train Handling Manual 64-33
64 Train Handling64.12 Grade Operation64.12.1 Operating On a GradeSince train speed largely determines the amount of braking distanceneeded, control train speed in a grade operation as follows:1. Do not exceed the speed limit.2. If you cannot control the speed of the train, make an emergencybrake application immediately.3. Early in the braking process, achieve a balance between the levelof dynamic brake and the level of air brake needed to controltrain speed on a descending grade.4. When controlling train speed while operating on a heavy ormountain grade, limit the effective brake pipe reduction to 18 psior less.5. When passing the summit of a heavy or mountain grade, do notexceed the maximum authorized speed for the descending grade.6. At speeds below 10 MPH, use extended range dynamic brakes ifavailable. Extended range dynamic brakes provide more retardingforce than locomotive brakes.7. To prevent the loss of dynamic braking, limit the locomotivebrake cylinder pressure to 18 psi or less.A. Stopping On a GradeWhen stopped on a grade, leave the train brakes applied unless theindependent brakes will hold the train.B. Recharging the Air Brake SystemIf the independent brakes will not hold the train on a grade, rechargethe air brake system as follows:1. Apply a sufficient number of hand brakes or retainers.2. Release the automatic brake.3. Recharge the air brake system.64-34 ARRC Air Brakes and Train Handling Manual June 1, 1996
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64 <strong>Train</strong> H<strong>and</strong>ling64.11.6 Slowing or Controlling Speed—ThrottleModulation MethodFollow these steps when slowing or controlling speed using thethrottle modulation method:SagCrestThrottle ReductionThrottle ModulationDirection of Travel0.50% -0.50%0.50%When slowing or controlling speed approaching a sag:1. As you approach the sag, reduce the throttle as necessary tocontrol train speed.2. Reduce the throttle further as the head end of the train beginsdescending.3. Just before the head end of the train reaches the ascending grade,increase the throttle.4. Continue to increase the throttle as the train ascends the grade.5. Reduce the throttle as the rear end of the train approaches theascending grade.June 1, 1996 ARRC <strong>Air</strong> <strong>Brakes</strong> <strong>and</strong> <strong>Train</strong> H<strong>and</strong>ling Manual 64-33
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