What is the difference/similarities between these systems? I have 4 Proto Sound locomotives and think they are great. I got my son a Lionel train set that had RailSounds. It's okay, but I think PS1 is so much better. Now I don't know anything about Loco-Sounds except that they are the command-less locomotives of PS2 locomotives. Do they work with the Lionel CW-80 transformer, or do they also refuse to go like PS2 locomotives will? I like PS1 locomotives because they work with the CW-80 and keep the sound going during direction changes and minor power drops because of the battery. RailSounds doesn't do that, and it kinda bugs me that when I push the direction button the sounds and lights quit for a moment. Does Loco-Sounds have this same issue?
As to why I'm asking, well, my son wants a steamer now (his is a Santa Fe F3) and I know where I can get a RailSounds equipped one for not a lot (A store that breaks up sets has them.). I've also found some nice locomotives on eBay with Loco-Sounds. I made an under the bed layout with a CW-80 that he'll use and I don't really want to buy another type of transformer.