Someone else with more electronics knowledge may have answer.

My first suggestion would be to write Tam Valley,  They designed the servo controls and the electronics circuit to go with it.  They might send you a schematic for wiring or advise you on how to do it.  They may even have a better servo product to control more complicated turnouts than the simple right or left hand switch.

Duncan Mcree e-mail

I did contact Tam Valley depot and Duncan did get back to me but he had no suggestions.

Stub or point?

Dear Mike,

Is this a 3-way _stub_ turnout
(IE 1x servo with 3 positions)

or a 3-way _blade_ turnout
(IE effectively 2 interleaved normal turnouts, thus 2x servos with 2 positions each) ?

If "3-way stub", then I'd suggest you're likely down to deploying micro-switches.
(The desired operation could be achieved on either turnout with 2 microswitches,
as long as they could be mechanically thrown by the actual throwbars.

Indeed, any "indicator" that is driven by the servo/control circuit can be fooled into thinking what the circuit _says_ the turnout is set for, not what the turnout is _actually_ set for,
IE a misbehaving turnout, broken throwbar, or similar, will not be indicated...)

If "3-way Blade", 
(and you definitely prefer the route indicators to be driven by the control circuits, 
and not the actual turnout throwbar positions themselves...)

the key is that:

- first turnout can be thrown either LEFT or Straight
- second turnout can be thrown either RIGHT or Straight

First turnout LEFT = Left route LED ON

First turnout STRAIGHT + Second turnout RIGHT = Right route LED ON

STRAIGHT + STRAIGHT = Centre Route LED ON

If you have some form of existing LED output for each leg of the 2 turnouts,
and you can somehow work out when both turnouts are set STRAIGHT,
(IE both Turnouts STRAIGHT LEDs are ON),

then you can work out the logic to turn on the appropriate LED...

EDIT: Just checked the Tam Valley page. The Singlet has a Remote Relay output.

- Connect a SPDT relay to each turnout
- Turnout 1 LEFT Output terminal feeds LEFT LED
- Turnout 1 STRAIGHT Output terminal feeds INPUT of Turnout 2 relay
- Turnout 2 RIGHT Output terminal feeds RIGHT LED
- Turnout 2 STRAIGHT Output terminal feeds STRAIGHT LED

If you don't wish to use relays, a pair of 555-based flop circuits connected "in series" the same as the relays outlined above, (and documented specifically for modellers on Rob Paisley's "Misc Electronics for Model Railroads" site http://home.cogeco.ca/~rpaisley4/LM555.html )

In short, a pair of simple 1in/2out or "SPDT" switches,
connected in series (head to tail, so to speak), 
will do what you require...

Can do up some quicky schematics if that helps?

Happy Modelling,
Aim to Improve,
Prof Klyzlr

Thank you for you responce and help

Prof Klyzlr,

         Thank you for helping answer my post. I know it's been a year later but as any good model railroader when stumped the best thing to do is set it aside and just ponder it and he can come up with a solution. With a layout as large as mine it's easy to find something else to do while trying to figure out a solution.

            To answer your first question the three-way turnout is a point turnout or not stub so it effectively uses to servos to move two sets of points. If you'd like to see what the turnout looks like. I will try to attach the PDF from FastTrack's for their three-way turnout. As this is a coal mine siding for the triple there are two three-way turnouts. I'd be very interested in looking at a way to use the 555 work out the LEDs. I'm familiar with Rob Paisley and his website.

            So any quick schematic you can come up with would be very handy. And I hope to hear you again on model railroad radio.

Thank you again

Mike Deverell

Fast Tracks Three Way Turnout

Hi Mike,

This is really what is normally called a "lapped turnout".  It is sortof two turnouts, one placed on top of another.  I built two of these and one is on my layout and uses bi-polor Red/Green LEDs in series with two Tortoises. (By the way, Tortoises are actually cheaper than any servo setup once you figure in all costs).  This particular setup is not optimum and the lights do not tell the complete story.  I have not installed the second scratchbuilt three way yet and dread doing the needful to provide correct indication, but I will.  I actually have 3 three way turnouts, one, a code 100 Shinohara (UGH UGH UGH!) that I installed in my hidden staging and definitely needed accurate indication,  It took me a while to figure out how to do this using the Red/Green bi-polor LEDs.  I was using NJ Internation/Kemtron/Tenshodo type dual coil machines in hidden staging and most had two sets of contacts per machine.  I needed one set for frog powering, so that left one free set of switches on each machine.  Once I figured it all out, I realized I needed four sets of switches, so added some micro (lever) switches and that did the job.  Since I will be using Tortoises, the same will apply.  Sigh, I will add micro switches in addition to the extra switch the Tortoise provides.  Maybe you will not wish to do it the same as I did and maybe all you want is a Green for Go indication?  That will be a LOT easier.  Check this website out and scroll about half way down and  you can see how this is accomplished for just lighting an LED on the powered leg.  

http://www.brian-lambert.co.uk/Electrical-2.htm

This is a slow loading site in the UK, but it is loaded with good stuff.  You may substitute the RED LED with a GREEN one.  That choice is up to you.

Surprisingly, the indication for a double slip switches was tons easier and required NO additional switches.  I was able to provide Red/Green LED indication, just using the Tortoise itself.

If you really want to provide Red/Green indication, Green for the selected leg and Red for the non-selected ones, I can dig in and look for my notes and post them here later.  I did not use any fancy electronics or 555 timers for indication.  I only use fancy logic with 556 ICs to power my Tortoises :o)

Regards, Vic Bitleris