Air Brakes and Train Handling Rules - Alaska Railroad

68 EOT Telemetry DevicesActivating the Distance Counter. To activate the distance counter:1. Press the CONTROL button (on the left side of the LCU frontpanel) one time, which then displays the distance the locomotivehas travelled in feet.NOTE: At first the distance increases whether the train istravelling forward or in the reverse position. However, if thetrain reverses direction, the distance counter begins decreasing.2. Press the CONTROL button a second time, which holds thedisplay at the net (forward or reverse) distance the locomotivetraveled. The display will flash.NOTE: If the distance count reaches its maximum value of± 19,999 feet, the count will freeze and the display will flash.3. Press the CONTROL button a third time, which resets and turnsoff the distance counter display.Calibrating the Distance Counter. To calibrate the distancecounter:1. Set the two-digit WHEEL DIAMETER switch (on the right sideof the LCU rear panel behind a small access door) by dialing thesecond and third digits (which represent wheel diameter) on theswitch. For example, for a 38.0-inch wheel, disregard the “3”and dial the “8” and “0” on the switch.NOTE: This two-digit switch accommodates wheel diametersfrom 35.0 to 44.9 inches.2. Check the wheel diameter setting as follows:a. Press and hold the DISPLAY TEST button on the LCU,which displays the wheel size setting on the DISTANCECOUNTER display. For example, a wheel size setting of38.0 inches would be displayed as “38.0.”NOTE: Charge units are also displayed in the PRES-SURE DISPLAY window.68-6 ARRC Air Brakes and Train Handling Manual June 1, 1996