Model Railroading > digitrax transponding???

Ok i looked back and found nothing or missed it on this topic in the past.

I want to hear from anybody who uses this feature on there layout, and how they like or/dis like it? what i need to make it work, are there sensors in the track how do they fit into the operation size wise, are they light sensitive? and how do they know when the whole train is clear? Basically whatt do i have to do its a new n-scale layout and is adaptable for this.

thanks
Aric

The Digitrax website should have the info. They use a current sensing module which I forget the part number. It is tied into the loconet I believe.