Jordon,
Thanks for the interest.
The scene represents mainline locomotives and coaches/carriages of the GWR (with the exception of the GWR horse-drawn omnibus which gives a sense of transport before mechanised railways.
The wagons and vans on the right are supposed to be "tucked away" there during the event and necessary shunting would have been done by the GWR pannier tank on the right which, though not a mainline passenger locomotive, was, nevertheless, a ubiquitous workhorse of the GWR. So it too is just there to complete the picture, as it were.
'Hope that explains OK.
By the way my son and his three children are all autistic too (at various levels of functioning).
Peter (Ireland).