Thanks to everyone who replied it was very helpful and it now works perfectly.

My son and I are constructing our first train layout and have bought some buildings and accessories, one of which is the Bachman Storage Building with Steam Whistle Sound.  The directions state that a 'power pack' is needed to hook up the leads from the building.  I have no idea what that is or where to get one.  We also have a water tower and searchlight to hook up as well.

And help from the forum members would be greatly appreciated.

I'm new at this, so please excuse my general railroad ignorance.

Sincerely,
A