I recently purchased a set of Brass Long Island Railroad B-3 "Rats" Electric Locomotives made by 3rd Rail. These are super detailed and came with an older QSI sound system. The sounds are similar to Proto-1 sounds and sound great. I am a big fan of the high pitch whistle.
Here it is running on the Nassau Lionel Operating Engineers Club layout in Levittown NY. The coaches are Long Island Heavyweights by Lionel.