I want to back off a bit on wanting a prime mover (or whatever we'd like to call it) sound for electric locos, and say that the Soundtraxx Econami 883004 used with my E60 is fine addition for this loco. Watching some videos of cab rides on YouTube showed that most have a very soft "mover" sound in real life when underway (the TGV's are an exception, this https://www.youtube.com/watch?v=qbKEeHzuBwc is one of my favorites--it just keeps going faster and faster for 7 minutes!), but that has nothing to do with the E60 or others. There is a definite sound with these American electrics when they pull into the station, but it's pretty subtle. An exterior "traveling sound" of either the whooosh on welded steel rails or the clickety-clack on mechanically joined rails would be a pretty neat sound though, something to look forward to. And, for old trolleys or MU's or subways, etc, there is a very definite sound that ought to be there.