Wireing For Block Signals With Atlas Switches

I also use the outside rail for signaling and the inside rail for common.  In several locations on my layout I have a switch at the beginning or end of a block, and in those locations I used insulated joiners on both the inside and outside rails on the end of the switch that's adjacent to the next block.  Similarly, I used insulated joiners on both the inside and outside rails where switches join to spurs and yard tracks.  This solves the problem of an occupied spur showing up as a mainline block being occupied.

Thanks for the info.  I took a long look at the switches and figured out if I remove the jumper wire that connects the through outside wire from the turnout side's rail that allowed me to still have the blocks with a switch in the middle and not set the signal from the spur.  Now that'll probably change if I go tot a loop within a loop with spurs in the middle of that.

Unfortunately the Atlas switch machines don't have any spare contacts for signalling. To get a clear  block  the switch  should also be included.

The deluxe under table machines do have double pole double throw contacts.   There is also the

Snap 200 relay that can be paralleled with any existing switch machine.   Click on underline phrases to link Atlas parts detail.

It is interesting to note that Atlas 6931 dwarf lights are designed to work with existing Atlas switch motors. 

More advanced, non-derail, switch motor wiring involves the 6924 relay boards.

Perfect Thanks Mike.

I'm asking about train block signaling, not point position signaling.

Ok... Switch point position is certainly an important part of block signalling... If a spur siding switch is open the block will show occupied..   Then again it's your railroad,  the main thing is having fun.