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Here is a paper discussing alerters: <a href="http://www.ntsb.gov/doclib/recletters/2007/R07_8.pdf">http://www.ntsb.gov/doclib/recletters/2007/R07_8.pdf</a> Here is a quote from the piece that discusses resetting alerters by reflex action:   “Alerters installed on new locomotives today require about the same level of cognition as those that existed when the Safety Board closed Safety Recommendations R-99-53 and -59. Typically, alerter alarms occur more frequently as train speed increases.13 Unlike the Sugar Valley accident in which the train had slowed and entered a siding before overrunning a signal, the northbound train in the Anding collision remained on the main track at higher speeds. Had an alerter been installed, there was a 4-minute time period after passing the approach signal during which the alerter would have activated four to five times. It seems unlikely that the engineer could have reset the alerter multiple times by reflex action without any increase in his awareness. Therefore, an alerter likely would have detected the lack of activity on the part of the engineer and sounded an alarm that could have alerted one or both crewmembers. Had the crew been incapacitated or not responded to the alarm, the alerter would have automatically applied the brakes and brought the train to a stop. The Safety Board concludes that had an alerter been installed on the lead locomotive of the northbound train, it may have prevented the collision in Anding.”
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