As a huge tube stock fan my self, recently bought the 1938 stock on TSW5. Interestingly I saw that there were 2 liveries, a red roof and a grey roof. After having a bit of fun with the red roof, I decided I wanted to see the Grey Roof "Preserved" version, but I can't find it anywhere, not in "Liveries" or anything. How can I go about accessing this livery?
I don't think it ever got added it to formation designer or the free roam spawn menu, the only places you can find it are the 1938 Heritage Tube Stock Timetable for Bakerloo line or some creators club formations here
From what I recall the 38 stock started having a bug where its railtours disappeared from the timetable selection screen, you can only play them by manually finding them running in Free Roam and taking over the service. This has been the case since at least TSW4
