I love the new timetable on WSR, and even though it won't be changed again for a long time, I'd really like to see those wagons kept in sidings being used for demonstrator freight runs. I'm not sure if the real WSR has them, but it would be nice to have a few freight trains running between Norton Antivirus and one of the yards at the west end of the route. Hopefully, with substitution we'd be able to use locos on the services that can't usually be used on freight trains in-game (but did so in real life) like the Class 33, 52 and 09.
I fully agree with your submission.. why have 12T vans on the railway and not use them? The route is set during a Diesel Gala so a demonstration freight service would be nice..