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Air Brakes and Train Handling Rules - Alaska Railroad

Air Brakes and Train Handling Rules - Alaska Railroad

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GlossaryStretch BrakingSlowing or stopping a train using the automatic air brakes <strong>and</strong>enough power to maintain a slack-stretched condition.StringliningThe result of excessive draft forces in a train negotiating a curve.Causes wheel climb, track damage, or derailment.Thermal Cracks (in wheels)Cracks in a railroad wheel, normally caused by heat generated onthe tread <strong>and</strong> flange of the wheel from excessive braking.Throttle ModulationAdjusting the throttle one notch at a time to control train speed<strong>and</strong> in-train forces without applying air brakes.Tons Per Operative BrakeThe measurement calculated by dividing the gross trailingtonnage of a train (not including the locomotive) by the totalnumber of cars with operative air brakes. Each platform ofmulti-platform cars equals one car.Tractive EffortThe force exerted by a locomotive on the track to move a train.Tractive effort is measured in pounds <strong>and</strong> decreases as locomotivespeed increases.Tractive Effort MeterThe device that indicates the tractive effort being produced by alocomotive with AC traction motors. It reads as a percentage ofrated tractive effort or a display showing pounds of tractiveeffort.Two-Compartment ReservoirA component on cars that contains both the auxiliary <strong>and</strong> emergencyreservoirs.G-14 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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