I know I can use a detector to automatically switch the polarity in the reversing loop, but is there a way to also have the switch machine change the position of the turnout, thereby making it a fully automatic reversing loop for hands off continuous running. I’m using DCC to control locos, but I’m opting to build a control panel for turnouts and don’t want to do it with DCC. If I had to do the reversing loop turnout with DCC, I would, but I don’t want to get into total turnout control with it. Just personal preference…
You’d have to have a stationary decoder that controls the turnout, and also supports ‘routes’. If you’re using Tortoise switch machines, DCC Specialties just came out with a decoder called the Hare that clips right on the bottom of the Tortoise, and supports automatic routing. I believe it also supports momentary switches on the control panel for control, so you have the best of both.
You can get more info on it at Tony’s Train Exchange: http://www.tonystrains.com/
Just add a normal detection block on each route. Have which ever dectector that senses a train throws the turnout that way. Two detectors, one relay to switch the polarity on the turnout, one relay to remember. Real simple old school stuff. It would be even easier with twin coil turnout motors. Hook the detector straight to the coil. Snap, all done.
Of course in one instance I did it even easier. I just put a spring on the turnout. The train always takes the straight route. When it comes back on the diverging route the points just move over and let the train pass. No motor, no circuits, no hastle.
Here’s a circuit that would work:
http://home.cogeco.ca/~rpaisley4/LoopStall.html
Guarantee that would cost a whole heck of a lot less than a Hare to build. The Hare is very nice, but I’d go broke if I used those for every turnout.
–Randy
Yea, I wouldn’t use a Hare for every Tortoise (I prefer the NCE Switch-It! for regular turnouts), but for a specific use like this, it may be worth the cost.