And Martin RS on RMweb found this:Someone on RMweb (Graham R) has suggested Dunfermline Lower, the canopy and signal seem to fit:
View attachment 190536
EXHIBITION OF L.N.E.R. ROLLING STOCK (In Aid of Dunfermline and West Fife Hospital Extension Fund.) Dunfermline (Lower) Station, SUNDAY, 29th July, 1928. Opening Ceremony by William Whitelaw, LL.D., Chairman, London and North Eastern Railway Company. 12.45 p.m. The Rt. Hon. The Earl of Elgin, G.M.G., Rev. J. W. Baird, B.D.
-Adults, 6d; Children, 3d. Tickets can be obtained at L.N.E.R. Stations.
Bingo! This led me to another picture of the same occasion - from Steam Supreme (R.D. Stephen). According to him the stock on display was: first and third sleeper (he used the singular), triplet restaurant car set from the FS, a Pullman, a first and third class corridor coach and the NB invalid saloon. He got the year wrong! I was surprised to see Sigmund Freud on the far right of the group.

Thanks to all here and at RMweb.