Since you have Steve's observation's on the Ross switches, why not use them. I have seen no complaints of corrosion on the forum. Then you have whichever you need. The #5's make nice mainline crosses. curved switches can save space creating a yard. You can use them with both Atlas and GG. The DZ switch machines are nice. Ross Ready is about the same money as any other switch with a motor.
So, the tinplating was working, except where it was removed. How about the painted ties? Any corrosion on the those? Tin over steel has been used for years. Look at RR lanterns and such.
I would be more concerned with the track connections and use some type of electrical grease.
Denatured alcohol is my favorite rail cleaner. Smells a little, but you don't need to use it often.
You can get what you need in Atlas. It just may take a few vendors. Try our forum sponsors. I know the shipping is a big factor, but most of them have good inventory.
