Air Brakes and Train Handling Rules - Alaska Railroad
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Air Brakes and Train Handling Rules - Alaska Railroad

Air Brakes and Train Handling Rules - Alaska Railroad Air Brakes and Train Handling Rules - Alaska Railroad

akrr.com
12.07.2015 Views

“B” End (of car)The end where the hand brake is located, unless otherwiseidentified.GlossaryBack-Up Valve or HoseA device, either portable or permanently connected to the brakepipe, that controls brakes from the car it is attached to. Thedevice can be used to apply the brakes with a service or emergencyapplication.BleedVenting air pressure to the atmosphere.Blended BrakingUsing automatically controlled mixed air and dynamic braking atthe same time to provide a retarding force on cars and locomotives.Brake Cylinder Release Valve (bleed valve)The valve that initially bleeds brake cylinder pressure. If heldopen, it will bleed auxiliary and emergency reservoir pressures.Brake PipeThe pipe, angle cocks, hose, and hose couplings that distributecompressed air throughout the automatic brake system.Brake Pipe GradientThe difference in brake pipe pressure between the locomotive (orsource of supply) and the rear car of the train. Brake pipe gradientsmay be:Normal Gradient: The gradient that exists when the system isfully charged.False Gradient: The temporary gradient that exists when thesystem is less than fully charged (for example, the exaggerateddifference between the head end and rear end after a release).June 1, 1996 ARRC Air Brakes and Train Handling Manual G-3

GlossaryInverse Gradient: The temporary condition when the brakepipe pressure is higher at the rear of the train than at the headend of the train (for example, during a service brake application).Branch Pipe Cutout CockA device on locomotives and cars that isolates the control valvefrom the brake pipe.Break-In-TwoAny unplanned train separation.Buff ForceCompressive coupler forces that occur during a slack bunchedcondition.CDUContinuous display unit; part of the Glenayre Digitairend-of-train telemetry device.Check ValveA valve that allows air flow in one direction only.Coefficient of FrictionThe ratio between the braking force caused by brake cylinderpressure and the resulting retarding force of the brake shoe at thewheel.Computer Controlled Brake (CCB)A computer-based electro-pneumatic system that controls airbrakes on locomotives and cars.Control CarA commuter car equipped with a control compartment to operatea train while being pushed by a locomotive.G-4 ARRC Air Brakes and Train Handling Manual June 1, 1996

GlossaryInverse Gradient: The temporary condition when the brakepipe pressure is higher at the rear of the train than at the headend of the train (for example, during a service brake application).Branch Pipe Cutout CockA device on locomotives <strong>and</strong> cars that isolates the control valvefrom the brake pipe.Break-In-TwoAny unplanned train separation.Buff ForceCompressive coupler forces that occur during a slack bunchedcondition.CDUContinuous display unit; part of the Glenayre Digitairend-of-train telemetry device.Check ValveA valve that allows air flow in one direction only.Coefficient of FrictionThe ratio between the braking force caused by brake cylinderpressure <strong>and</strong> the resulting retarding force of the brake shoe at thewheel.Computer Controlled Brake (CCB)A computer-based electro-pneumatic system that controls airbrakes on locomotives <strong>and</strong> cars.Control CarA commuter car equipped with a control compartment to operatea train while being pushed by a locomotive.G-4 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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