Air Brakes and Train Handling Rules - Alaska Railroad

OverchargeGlossaryWhen brake equipment on cars or locomotives is charged to apressure higher than the regulating valve setting.Over-ReductionA service brake pipe reduction to a pressure lower than a fullservice application.Penalty Brake ApplicationAn automatic brake application at a service rate caused by asafety control device (electronic alertness device [alertor],overspeed, or foot pedal).Planned BrakingThe braking process that occurs when the engineer has enoughtime and distance to slow, control, or stop the train in the safestand most efficient manner.Powered AxlesAxles driven by a traction motor.Pressure Maintaining BrakingControlling train speed by making enough of a brake pipereduction to stabilize speed on a grade, then allowing the automaticbrake valve pressure maintaining feature to hold the brakeapplication constant regardless of brake pipe leakage.Pressure Maintaining FeatureA system designed to overcome brake pipe leakage in both theRELEASE and SERVICE positions of the automatic brakevalve. This feature allows a constant brake application to be heldas long as needed.PropagationThe serial action of a brake application from car to car througha train.June 1, 1996 ARRC Air Brakes and Train Handling Manual G-11