I still haven't had time to go and get some thinner, so I haven't made any progress there.

I have been thinking of point control circuits that also switch the frog polarity, as I said in the last post. Here is what I have come up with:

Using a standard DPDT switch:

S1 is a normal (non momentary) DPDT. The top half is connected to the 12V DC auxiliary output of my Gaugemaster controller and powers one of the two transistors (Q1 or Q2) through an RC (R1 and C1 or R2 and C2) network that converts the direct current into a pulse (C=1uF and R=100kOhm should give a pulse of about 0.1s). This switches on the appropriate transistor momentarily, so that the 16V AC output is connected to the correct motor coil.

The other half of the switch connects the frog to the correct polarity track power output.

I haven't tested this yet, but I think it should work all right. I'll keep you posted.

As I said in my last post, I was thinking of a different arrangement using a momentary switch and a flip flop to power the frog, but thinking about it it just seems to be more complex, as I'd have to use the track power output to power the flip flop, which will probably cause trouble at low voltages.