Tom, here's a video on how to tune up/repair Lionel horns for the 2000 FA's, which you have: <https://www.youtube.com/watch?v=3LsDKsNBBKQ> One thing about horns is making sure that all moving parts, including the little plate under the relay coil moves freely. I always remove the actual horn and make sure all points are sanded a bit and cleaned to make sure the electrical contact all along the way is good. Over decades, those points either get a bit loose or buildup of some kind, even rust. All avenues between roller, relay, and horn need to be clean and solid. Once you get the horn back in place, slight twisting of the little horn screw will get you the tone you want!
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