Although not named, the set is referred to as King of the Railway, based on the upcoming film of the same name.
It has Thomas pulling a truck up a hillside, through a castle entrance and emerging out of the castle and down from the hillside.
Toy Fair's Aaron let slip a couple of spoilers to presenter Laurie over the film's plot; Its a brand new adventure for Thomas, The Earl comes back to Sodor and restores the old castle from its ruins.
The film's poster artwork featuring Stephen and Thomas was present at the event as a backdrop.
King of the Railway: The Movie premieres in the UK, US, Germany and Australia from this September.
Thanks to TheHIROD51 for the alert.