Ok, got it. I was thinking it was probably visual, but the way I read it, there was a hint that is could possibly have some type of electronic use which I did see as being likely (I thought I was reading too much into it).
Anyway thank you for the clarification and the details on the un-coupling track. I have a few of those, but have not yet decided where to put them all. This will help with my locations for them.
