The sound controls on my Lionel KW do not work. I want to use two buttons for my MTH ProtoSound 3. Instructions say all track power must be wired through the buttons. I want to use a Bus line on my layout so how do I wire the rest of the track feeds? A diagram would be nice! Thanks!

What exactly is in the Lionel 10-5906-001 Sound Activation Switch? I find very little on it, but some obscure reference mentioned a D-Cell battery. I have a Rail-Sounds boxcar, and I'd like to get a reverse polarity DC bias to trigger the bell. If this is just a D-Cell with a swtich, I might...