Dennis H,
With all your Tin Plate you are going to be most unhappy trying to run GG, because of the depth of the GG Track, it does not play all that well with Tin Plate Trains, forget the switches all together.
If you plan to run Tin Plate a lot, stay with the good old Lionel Conventional Tubular and use the 711/072 switches for best running. The other switches that handled Tin Perfectly is the original old K-Line Super Snap low voltage switches. Good luck finding them however. RMT's are not exactly the same and have other problems. I tell you this from experience, FasTrack is Great with the Command Control switches, but as George has pointed out, some of the early Tin will not go thru the switches, mostly this is because of some of the 12 wheel tenders with the deep set Trucks. For your Scale engines that do not like Tubular, use some sound suppression ceiling tile and run the FasTrack with the 072 CC switches and Legacy Cab2 HHRC. Incredible engineering, no wiring needed.
For these reasons I run either Lionel Conventional Tubular or FasTrack with my Tin Plate Trains.
PCRR/Dave
The Donovan's Reef Bar Top Layout, built with FasTrack and 072 FTCC Switches.
The lower FT layout features a 14' Tunnel thru the Bar, with 072 FTCC Switches also.