Yes, Woolwiches and “A”s.
As for train make-up, I don’t know exactly, but any wagons would be fitted ones, obviously.
Coaching stock on the Midland main lines would have been bogie corridor stock by the 1950s, both of old wooden varieties (no two alike!) and by degrees Bredins, laminates and PRs. Six wheel passenger brakes would still feature large, of course, along with new tin vans.
Maybe someone else can comment on exact make up of “perishables”?