No. Or to give a more detailed answer, all TSW routes are to remain as they are, after the release of the Class 20 for TVL, and that includes after they are preserved in TSW2. There will be no more Loco DLC for current TSW routes, in either TSW or TSW2.
A seriously missed opportunity. So many of the current routes are under utilised in traction classes terms. No further classes to be added, no add ons to the routes (ie branches), no sharing of classes on multiple routes, and no ability to use new features. This is something completely lacking. It feels like all our spent money has led to abandoned content. This should be addressed, perhaps not right now, but certainly later and bit by bit. I am sure that i am not alone in having this view. I do however understand that it would be a lot of extra work for DTG, but have asked if the preserved collection will be open for third party DLC content seeing as how DTG are not doing any.