Does anyone make a simple, non-DCC sound system to produce sounds for a railcar? It doesn't have to be specific prototype, just a basic gasoline motor sound would be fine.
I have no experience with Ram Track, but they have some sound modules so you might want to give them a try.
http://www.ramrcandramtrack.com/
I don't know how simple they are but Phoenix Sound come with several different gasoline sounds.
http://www.phoenixsound.com/library/other.html