ogg,
I have noticed that the track you shut it off on is the track it turns back on with. The sound module appears to have a memory for where it was prior to shutdown.
I appreciate your interest! I was not sure about when to post this. I wanted to post it before York so if someone is interested, I can show 'em at York. But, I won't be ready to provide these units to others until after York week, because I'll be there not here! If you're contact info in your profile is accurate, I'll email you with info shortly after York... ditto for others who may be interested.
I thought about passenger cars and wasn't sure what the sounds would be... probably no banging and clanging, and less brake squeal (although there's lots of both on Metro North here!) Suggestions on sounds to include would be appreciated.
For passenger cars, I'll think about a way to access the needed controls from underneath - something to think about while waiting for York to open on Thursday morning before noon! 
A car with see-in windows and visible seats would be tricky!
ed
