Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Nice set-up for sure .... I've never seen a Battery Eliminator either, but assume it must be some form of capacitor.

Who manufactured that sounder .... Wunel or something like that?

Are there any T&P markings on either the sounder or the key?

You ought to have some good fun with that one and your other set-up, you could string wires out to the shed and have a dinner call communicator!  ;c)