BMORAN4: i looked at that PDF and saw on page 37 how to use an insulated track to trigger a double throw relay. Here's the picture:
A question for anyone: I'm not smart about electrical diagrams such as is shown but probably can experiment enough to figure it out. BUT.... Here's something that I can't figure out. Looking at the diagram, the upper left corner shows an "INSULATED BLOCK". I notice that the center rail is isolated in the diagram. How does the track get power???? WOn't the train just stop right there because the center rail is not powered?
OR: since the diagram doesn't show a power source anywhere, can I assume that the "insulated block" has a lockon connected to it, just like the entire trackage to the right of it does not show a lockon either?
as always, thanks - walt
