
GP38/SD40 Locomotive Operating Manual
6
Speed Recorder / Alerter
Vigilance alerter is a device, which is designed to prevent accidents caused by fatigue or incapacity of
the driver. The alertness of the engineer is checked when he has shown no activity during a fixed
time period. Shows the engineer no response to the graduated alarm, the train will stop
automatically. Nowadays most U.S. locomotives are equipped with such devices.
Fig. 4 Speed Recorder / Alerter
ALERTER OPERATION
Fig. 5 Alerter Timing Diagram
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