very quickly: I think the rails from the frog (the short ones) are used to run the non-derailing feature. However, they have to be insulated from the rest of the track with a plastic pin (Lionel calls them FIBER PINS). The hum is because the switch is constantly trying to turn both directions at once.
Take all the rails off of the end of the switches. mow turn the track power on and use a short piece of wire to touch the outer rails at the end of the switches. This should cause the switch to change. Now you have to put the insulated pins in those rails.
--David
You'll get a better response if you post the question over on the "Classic Toy Trains" forum. I know it's a bit confusing that Trains has two forums with similar names, but this one is for real trains. The "Classic Toy Trains" forum specializes in the stuff you are interested in.
You can get to that forum using the 'forums' button at the top of the page or try:http://www.trains.com/trccs/forums/95/ShowForum.aspx
Good luck,
Ed
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