Or do what I did, take out the original sound unit and replace it with a Dallee "Stamp" sound unit and a speaker. (Doug at Port Lines has them, or order directly from Dallee). These units are easy to install, the whistle and bell are great and it will fit easily in the tender. I have been very happy with the unit. You do need to have a transformer that will activate a whistle and bell, or you can wire in activators from Dallee or Lionel to trigger the sounds.
The Dallee website has audio samples of the sounds if you want to hear them.
LittleTommy
