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For Tree68: <br /> <br />Yes, the typical electro-mechanical relay can have an exceptionally long life. But, for the Code Follower relays, they are in constant motion 24 hrs. per day. The only time they do stop is when the track circuit is occupied, or, during times of signal trouble. On the ABS territory, when you walk inside of a location house, case, etc., you hear the constant clack-clack-clack-clack of the relays coding. They wear out over time, contacts can arc, etc. It's just the nature of the mechanics. For all other relays, they'll either be sitting "at rest", or, energized in the "up" position - those will last the longest.
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