Air Brakes and Train Handling Rules - Alaska Railroad

68 EOT Telemetry Devicesb. Check wheel diameter size regularly (at least every 90 days)to make sure it matches the actual locomotive wheel size.c. Check wheel diameter size whenever the wheels are turnedor replaced.B. Pressure DisplayThe last car brake pipe pressure display shows pressure to a maximumof 125 psi. This display is updated automatically and functionsas a remote last car air gauge.If the brake pipe pressure drops below 45 psi:1. The LCU sounds an alarm (5 beeps for 5 seconds).2. A LOW PRES message appears in the message display windowand remains until the brake pipe pressure rises above 45 psi.C. Marker Light Status DisplaysThe marker light status display reports whether the high visibilitymarker (HVM) light on the last car is on (HVM ON) or off (HVMOFF).TRAINLINK ® II also performs an automatic marker light test,allowing the locomotive engineer to check the marker light withoutanother person operating the EOT TEST button. The test activateswhen:• The EOT is on and operating with at least 45 psi of brake pipepressure and no motion has occurred at the EOT for at least30 seconds.• Under these conditions, when the train begins to move, theHVM ON indicator on the LCU will illuminate.NOTE: If the train stops within the 30 second test, themarker light will go off. Also, this test cannot be performedat night since the light sensor keeps the marker light on.June 1, 1996 ARRC Air Brakes and Train Handling Manual 68-7