Air Brakes and Train Handling Rules - Alaska Railroad

64 Train Handling3. If unable to contact the train dispatcher:a. Reduce the tonnage.b. Arrange for assistance from helper locomotives.orc. Double the hill.C. Short Time CalculationsFollow these guidelines to determine when short time rating limitshave been exceeded.1. For locomotive operation in short time rating levels with lessthan 20 minutes between short time events:a. Make sure that the sum of the times does not exceed thelevel reached in the most restrictive zone indicated by theload meter.2. For locomotive operation in short time rating levels with morethan 20 minutes between short time events:a. Count each occurrence separately.64.4.2 Minimum Continuous SpeedMinimum continuous speed is the slowest speed at which a locomotivecan operate continuously in Throttle 8. Locomotive tractionmotors operating under these conditions develop the highest amperagepossible before overheating. The minimum continuous speedvaries according to the locomotive’s:• Gear ratio• Type of performance control• Power reduction64-10 ARRC Air Brakes and Train Handling Manual June 1, 1996