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Well, its your luck day. I am a horn expert. Standard cab locomotives have thier horn valve directly in the airline that feeds the horn. So it works like a water faucet. Wide cab locos have thier valve behind some paneling, and its controled by a single stage electric relay (the push button on the consol). On Amtrak locos, they have a two-stage relay to give them a "city" stage and a "country" stage all in the same button. So Amtrak engineers can pu***he horn button all the way down for the "country" stage of the relay, or half way down for the "city" stage. This is useful for when the train is in a station or a suburban area and cant disturb nearby residents.
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