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What about the sound systems that go under the layout ??
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I designed a sound system that's activated by motion detectors mounted under the layout. When the train passes over the motion detectors it activates the sound system for either steam whistle or diesel horn depending on what you prefer by flipping a switch. I built my first diesel horn sound system from scratch using a door alarm, a push button from Radio Shack and a 9 volt battery. I had to manually pu***he button any time I wanted the horn to sound. Really prehistoric but it worked real well. <br /> <br />trainluver1
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