MTH Signal Bridge Wiring Design Question

Baldoc posted:

...

I know that some sort of sophisticated logic device might solve my problem, but anything like that is beyond my level.  Is there a simpler way that I can get my desired result?

So your turnout provides output wire(s) that indicate straight vs. diverge?

Also, your existing wiring diagram would be handy as a starting point. 

What constraints do you have?  Less than $10 out-of-pocket?  No soldering?  No messing with small components (diodes, resistors, whatever)?  No eBay - only stuff you can get at local Radio Shack or whatever?

Is this what we're talking about?

Consolidated Leo posted:

Is this what we're talking about?

I suspect it is, but all of the MTH signal offerings that I'm aware of are meant to be fairly stand-alone -- working off some type of very simple detection device or relay.  The yellow aspect is based solely on an internal timer circuit rather than whether trains are actually in proceeding blocks.  For my purposes, the MTH signals work great, since the signaling I plan to have is minimal -- only protecting track blocks that travel underneath mountain scenery or tracks approaching a station or grade crossing.  

But I can see some folks may want more prototypical signal operation, in which case Atlas-O's system may be a better choice since the signal controllers are linked.

Once you start introducing more complicated criteria (typically at interlockings) for the signal indication (i.e., turnout positions, trains in the proceeding block, etc...), it typically involves logic circuits where relays are wired in series/parallel as needed based on the 'and' and 'or' criteria established for the interlocking.  

David

And the relay module ?

How about something like this?

Here's the rest of what I think will do what you're looking for.

NOTE: There's an error in the drawing. The DPDT relay is labeled backward. The Normally Opens should be the Normally Closed and visa-versa.

I've updated the drawing. Here it is with the labels fixed.

Many thanks for the replies.  I am always amazed at how quickly people respond to posts.

Leo, I appreciate the schematic.  I will give it a try.   It appears that it is designed use the DPDT relay to cause the Switch Relay to override the Single Track Relay when the single track section is unoccupied - exactly what I am looking for.