FYI, If the RA Class 43s were to come to TSW, you would all the british RA rolling stock as that is the only freight wagons that they pull. I have never seen a RA Class 43 perform a drag movement
Whilst it would be nice to see these in game there is very little for them to do unless you have a whole host of DLC to include them on different route and attach to stock etc. I think the only way to get these in game is to have them as a DLC and as they are such a niche I’m not sure it would sell very well and therefore benefit the time to develop them. I’d suggest the best bet would be an HST pack to include power cars and sets that are not mainstream passenger stock (New Measurement Train, Colas stock, Blue Pullman etc) they would all then need to be layered onto routes. Just a thought