Airfix Railway System
Illustration from the 1977/78 Folder Catalogue and the 1978 full Catalogue
The picture shows a GWR Castle Class locomotive coming into the photograph. At this time it had not been announced as being due for production and it was not released until 1979. The locomotive shown is not one of the Airfix production models as among other differences, it has a smoke box number plate and different valve gear covers and looks rather small
Illustrations from the 1979 Catalogue
Peeping in, a N2 Class Locomotive, which, whilst planned, was not produced until much later in Mainline Railways days.
In the same catalogue a Bulleid coach can be seen, again not produced
Thanks to Maxwell Roberts for pointing the last two out