I JUST BOUGHT A POLAR EXPRESS ANNOUNCEMENT CAR AND IT NEEDS A BELL BUTTON ON THE TRANSFORMER TO ACTIVATE THE ANNOUNCEMENT. I AM USING A POSTWAR ZW WHICH OBVIOUSLY DOES'NT HAVE ONE. IS IT POSSIBLE TO BUILD AN EXTERNAL CIRCUIT WITH PARTS FROM RADIO SHACK TO SIMULATE THE REQUIRED BELL BUTTON?
I'm sure it is, but I would just buy the 610-5906-001 Sound Activation Button. It was made precisely for what you want to do. Instructions for installing it here:
http://www.lionel.com/ForTheHobbyist/GeneralTipsAndFAQs/
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