GE Cab, Alerter
The Alerter button is a button which is seen in a diesel locomotives and electric locomotives.

This button is designed to reset the alert system countdown in case the engineer is awake and aware of the situation but wish's to not adjust the throttle brake or use the horn. The device counts down from a set number (in seconds) depending on the locomotive's speed. If the alerter is not reset when the timer reaches zero, the locomotive and any attached locomotives would be placed into "emergency" and the train brakes would be applied immediately.

These buttons are only seen on diesel and electric locomotives. 

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