Not to hijack Tommy’s thread, but back in the day…when I still had a mighty outdoor railroad empire I fiddled around with sounds a bit. My favorite outcome was arranged over three of my boxcars. I installed one sound card from ITT and one from RAM inside what was to become the middle boxcar; each card had a different flange squeal recording. I then drilled a bunch of holes in the floors of each end of the other two boxcars. I installed two speakers face-down on each end of those boxcars. I then connected one speaker from each sound card to each speaker, using micro connectors from Minatronics. As a result, each boxcar played the sound from each card on individual speakers, separated by the boxcar in the middle. Confused yet?
All coupled up, here’s the result, a proper short fast Grande freight:
http://www.largescalecentral.com/filesharing/file/view/14606/mov00886-mpg
Sorry for the poor quality, but hey - it was 15+ years ago. In later years I built stockyards, and yes, my stock cars moo’d.
Cheers,
Matt