FYI
Could not find any thing for galloping goose,or similar, that would fit without a butcher job so settled for an MRC 1662 sound only chip. Fits easily under roof and 28mm speaker fits behind rear bulkhead. Easy installation and sounds good.
locoron
The ESU Loksound web site has a number of European (German?) rail bus souind decoders that sound as though they could be appropriate for the Bachmann rail bus since it is a "freelance" design . You can listen to the various sounds and pick the one you like. The Goose is there also listed as sound # 72461 on the US sound page.
You might want to read this previous posting ref sound in the railbus .
http://www.bachmanntrains.com/home-usa/board/index.php/topic,6929.0.html
Alan Ashworth
Maybe this site will help.
http://www.phoenixsound.com/library/other.html
Have fun listening in on this one.
http://nl.youtube.com/watch?v=k3IGgpFlbU0
The result of the link (with the european sounddecoder) mentioned above by Alan Ashworth
John Baron
Netherlands