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GP38/SD40 Locomotive Operating Manual

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

1 2 3 4 5 6 7 8 9 10 11 12

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