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There are also event recorders located in the interlockings, and, road crossings. Some models we use can monitor 128 relays, and, some monitor over 200 relays. They're digital storage devices that record "logic high" or "logic low" via a relay contact inside the relay(s) you wi***o monitor. The only time something gets logged in is when a relay has changed state, for example, a relay that was de-energized "down" has now been energized into its "up" state. Once the recorder has filled up, it will bump out the oldest entry to insert the latest entry. Some data recorders can hold 30 days of data, some locations hold less. It all depends on how much memory you purchased for the data recorder, and, how busy the location is where the data recorder is installed. The data recorder was very useful to us when we had the Amtrak crash in Chase, Md on Jan. 4, 1987.
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