Hi, try searching for Freightliner on the dls. You should come across a 60ft flat car modeled on the freightliner wagons from the 1970s. (It will carry one 40ft and one 2ft at the same time or just one of each). I think it was created by maggs. Also try searching for content creators; Bloodnok and eldavo. Both have produced excellent uk rolling stock capable of carrying 40ft containers. Hope that helps.