Thank you, both.
I find it very interesting to accumulate knowledge in this way. You can't beat tapping into guys with a lot of swiss railway knowledge.
I am seriously considering modelling St Moritz in early 1970s condition. I have the track plan as at 1966 which wouldn't I assume have changed much by early 1970s.
So the line to Chur will have stahlwagens fronted by Ge 4/4 is, Ge 6/6 I & IIs, Ge 4/6s with I assume Ge 2/2 or Tm 2/2s buzzing around on shunting duties.
Meanwhile the Bernina platforms will have ABe 4/4 I & IIs to-ing and fro-ing with the odd RhB coach and a couple of wagons in tow.
Pete