Fine scale 7mm on Cargraves Phantom track

I'm only guessing here, but I would be surprised if your "fine scale" would be happy on Gargraves track. I run "regular"size 2rail stuff on that brand of track without any problems, but if by "fine scale" you mean small flanges and thin profile wheels, not too sure.

Mark in Oregon

Early on in O I was learning a lot.   I started with Lionel and converted to Gargraves track.     Then I learned more about scale equipment and evolved into what you call today 3RS     I was building O scale kit cars and running 3 rail track.    I did simple conversions of some scale engines.    I just simple put center pickups on the loco or tender.    I did this with an All Nation 4-4-0 I built and a GEM 2-6-0 I bought.    Up to that point I used lionel trucks or others with big flanges.     However, I learned I could easily run these locos on gargraves track.   At that time, Gargraves had a very flat top rail.   I don't know about now.    But these locos had US scale wheels.   And later I added a Gem 0-6-0 with scale wheels.   And that one I ran as 2 rail DC on gargraves.

So if your 7MM finescale flanges are similar to our US scale flanges, they should run OK on gargraves track.   I had a lot of switches on my layout too, it was operations focused and the did OK On them.   I did have to glue shims to the top of the guard rails on at least some of the switches as I remember.   

My next adventure was migrating to 2 rail when I met a guy who taught me to hand lay track.

I have been learning about Darstaed and Dapol lately.  Some of it is beautiful.   I sure you are aware the default power for Darstaed seems to be 3 rail dc.  Anyway , I believe a number of the finescale crowd is using gargraves or Ross track.