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Well, its your luck day. I am a horn expert. Standard cab locomotives have an air valve directly in the airline that feeds the horn. It works like turning on your water faucet. But on the newer wide cab locos that same valve is located behind paneling and controled by a single electric relay, with one exception. Amtrak locomotives have a two-stage relay, or better yet, a "city" stage and a "country" stage all in the same button. So the engineer only has a half on or all the way on with those horns. Amtrak engineers need to be able to have that "city" or half stage for use in suburban or station areas. I hope this info helps.
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