Nigel Burbidge
I tend to use a combination of couplings. All of my locos and wagons are fitted with three link couplings (as the closest to much of the real thing in the period I model – 1950’s). My carriages are formed into fixed rakes, with three link/screw couplings at the ends of the sets to enable coupling to a locos but with Kadees within the set. The corridor connections tend to mask the couplings to a large degree and Gresley/BR standard stock would have had buckeye couplings anyway.
Nigel