Air Brakes and Train Handling Rules - Alaska Railroad
Air Brakes and Train Handling Rules - Alaska Railroad Air Brakes and Train Handling Rules - Alaska Railroad
66 Locomotive Equipment and ComponentsThe two-position cutout valve has these positions:IN. Provides control of brake pipe pressure from the automatic brakevalve. Equalizing reservoir and brake pipe pressures will increasewhen the automatic brake valve is in RELEASE.OUT. Disconnects control of brake pipe pressure from the automaticbrake valve. Use this position when:• Not using the automatic brake valve to control brake pipepressure (trailing locomotives or locomotives hauleddead-in-train).• Conducting brake pipe leakage tests.66.2.2 Three-Position Cutout ValveOUTFRTPASS3 POSITIONFigure 66-D. Three-Position Cutout Valve.The three-position cutout valve has these positions:FRT. Provides control of brake pipe pressure from the automaticbrake valve. Equalizing reservoir and brake pipe pressures willincrease only when the automatic brake valve is in RELEASE.OUT. Disconnects control of brake pipe pressure from the automaticbrake valve. Use this position when:• Not using the automatic brake valve to control brake pipepressure (trailing locomotives or locomotives hauleddead-in-train).• Conducting brake pipe leakage tests.June 1, 1996 ARRC Air Brakes and Train Handling Manual 66-5
66 Locomotive Equipment and ComponentsPASS. Provides control of brake pipe pressure from the automaticbrake valve. Equalizing reservoir pressure and brake pipe pressurewill increase from any movement of the brake handletoward RELEASE.In freight service, if the equalizing reservoiris leaking, PASS may be used to maintainconstant brake pipe pressure during anautomatic brake application.66.3 MU-2A/Double-Ported Cutout CockThe handle for the MU-2A cutout cock is spring-loaded; push it inbefore changing positions.66.3.1 MU-2A ValveTRAIL6TRAIL24-26DEADLEAD ORFigure 66-E. MU-2A Valve.66-6 ARRC Air Brakes and Train Handling Manual June 1, 1996
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66 Locomotive Equipment <strong>and</strong> ComponentsPASS. Provides control of brake pipe pressure from the automaticbrake valve. Equalizing reservoir pressure <strong>and</strong> brake pipe pressurewill increase from any movement of the brake h<strong>and</strong>letoward RELEASE.In freight service, if the equalizing reservoiris leaking, PASS may be used to maintainconstant brake pipe pressure during anautomatic brake application.66.3 MU-2A/Double-Ported Cutout CockThe h<strong>and</strong>le for the MU-2A cutout cock is spring-loaded; push it inbefore changing positions.66.3.1 MU-2A ValveTRAIL6TRAIL24-26DEADLEAD ORFigure 66-E. MU-2A Valve.66-6 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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