Todd Haskins said:
I have a LGB stock car with the sounds of horses and I would like to add the sound of cows to another car and maybe sheep to another to make up a really noisy train.
I know that there are different companies that make these sound boards but which should I invest in?
I plan to run track power with a battery backup.
What are your experiences with these sound cards.
Todd - if you aren’t opposed to doing your own there is a very nice board that can be had for less than $10 that allows you to add your own MP3 files to a microSD card that fits into the board. I have used dozens of them for a host of projects - you only need some sort of power supply (can be batteries), an 8 ohm speaker and an SD card.
Audio files can be download from a bunch of sites on the Internet and the board contains an amplifier that may provide all the volume you need.
Some notes are here:
http://www.trainelectronics.com/Arduino/MP3Sound/No_Arduino/index.htm -
If you need more info please let me know -

dave