Controlling a 4-way switch with one Momentary switch for each path.

I have been home too long! I see now that if I add 4 diodes; one to each line in between A C and A D; conversely between B E and B F.  this will work.

Will the diodes actually work?

Asking because, aren't the switches AC-powered?  AC current flows both ways.  Diodes normally stop the flow of electricity in one direction only.  Not sure, but don't think one diode in each line will work. 

Definitely not an electrical whiz kid here mind you, but understand these electronic things on a (very) limited basis.  

Thinking about it, maybe this will work...............

Run a wire from your track ground to one side of a momentary push button.  From the other side of the button, run a wire (or wires) to both 'A' and 'C' (A & C being your non-derailing rails on the turnouts themselves).  This should control your A-C route only.

Then, run another wire from your track ground to one side of another mom. push button.  From the other side of this button, run a wire (or wires) to both 'A' and 'D' (once again, your non-derailing rails on your turnouts)  This should control your A-D route only.

Repeat this again with two more push buttons, one each for your B-E route and then your B-F route.

This should work, as the momentary push button switches merely substituting for wheels rolling over the rails.  Once again, not an electronic guru here, but for non-electronic wiring, I'm usually much better.  USUALLY. 

From a former engineer who did really bad in the three (3) forced ELEC Engr courses required  in the common core and as such for semi-conductors, diodes are my limit:

I used four (4) diodes to channel flow from the isolated parts of Ross' 4-way switch; See labeled C, D, E and F to the three DZ-2500Cs such that if ground is connected to "C" isolated rail  the first machine (not shown)  is toggled along with the top switch machine so both machines set the switches toward the "C" spur.

When "D" isolated rail is grounded the top  switch machine is toggled  so the path run to "D" and so on for paths E and F.  

The Blue wires go to the isolated rails of the first switch machine; the orange set goes to the isolated rails C and D of the top machine; and the blue set goes to the isolated rails E and F controlling the bottom machine.

The next step is to use my 3D laser printer to make a panel mountable switch housing to fit four(4) momentary contact switches like I made for my Ross 3-way.

This is much the same circuitry as I did for the Ross 3-way using DZ-2500Cs.

3D model of momentary switches 4-way housing to be 3D printed. The marked buttons fit over the micro-mom. switches inside the housing. The button  key-ways  force the buttons to be aligned.

Using this replaces the three DZ-2501s so the white wire is not needed unless I want to light the buttons showing present set direction path of the 4-way.

Really interesting thread, can we see this operating?

Very interesting. Have one of these 4ways that I plan on feeding into my switch yard.  I think I have the concept figured out. If it's not too much trouble could you sketch us a wiring diagram?

This will greatly simplify operating this switch.

1. you will need to create 2  non-derailing rails for the first switch by cutting the inner two rails. Fill gap with caulk.

2. I re-wired all 6 non-derailing rails with separate color-coded wires.

3.     wires shown below connect the 6 non-derailing rails.

4. from the 4 end non-derailing rails connect to 4 momentary switches to ground.