Air Brakes and Train Handling Rules - Alaska Railroad

66 Locomotive Equipment and ComponentsThe MU-2A valve has two positions:LEAD or DEAD. Engages control of the independent brakes on asingle locomotive or on the controlling locomotive of a multipleunit consist.Use LEAD or DEAD when a locomotive is hauled dead-in-train.TRAIL. Disconnects control of the independent brakes from theindependent brake valve.Use TRAIL when a locomotive is trailing in a multiple unitconsist. Move this valve to the position that indicates the locomotivebrake equipment type on the lead locomotive.66.4 Electronic Alertness DeviceAn electronic alertness device stops the train with a service ratebrake application if the engineer does not respond properly. It functionsas follows:• The device begins functioning when locomotive brake cylinderpressure falls below 25 psi.• At this point, the device monitors the operator’s alertness.• It resets when the operator changes the position of or operatesone of these locomotive controls:— Throttle— Horn— Dynamic brake— Device reset button— Automatic brake valve application— Independent brake valve application• If the device is not reset within the reset cycle identified inRule 66.4.1, Intervals Between Resets:— A warning light flashes— A warning horn sounds off and on for 10 seconds, and thencontinuously for 10 secondsJune 1, 1996 ARRC Air Brakes and Train Handling Manual 66-7