1906 stock (gate stock) the first tube stock that the bakerloo line had in service and stopped in 1953 and there is a part of one preserved at action depot 1914 tube stock where built for the bakerloo line extension and they were out circa in 1935 1938 stock which was in operation on the bakerloo line and the northern line and some were used on the piccadilly line, the 38 stock was slowly replaced by the 1959 stock in in 1983 but that was in till the 1972 was available. I now that island line has the 38s but that don't have the middle cars. 1949 stock was built for the planned expansion to Camberwell but that was cancelled so the 1946 got use on the northern and piccadilly lines as well, the 1949 stock got fully go in 1978 and was replaced but the 1972 stock
1938 shouldn't be too difficult as it is in IOW. (As you indicate). Personally I would like to see a route expansion, i.e. taking in Euston to Watford DC Lines. At a pinch they could use the 313 on that. Adding the North London Line as well probably too much to ask.
Those wouldn't make sense for that unless they formed some railtour service on the Bakerloo line. I rather have the London Overground Watford DC Line which run on the Bakerloo from Queens Park to Harrow and Wealdstone and south of queens park to London Euston and north of Harrow to Watford Junction with the 378s and the 710s as a extension to the line instead of old heritage trains to be honest
These are some good ideas, but there's a high chance they won't get put in the game. This is the modern version of the Bakerloo Line, so only the 72 Stock and Overground trains run on it. The most I see them doing is putting an Underground Livery on the 38 Stock and adding some type of vintage scenario for railfans. I'd prefer to have the whole Watford DC Line of the London Overground with the 313's/378's or 710's.
For realism purposes, no but they would indeed add some variety to the route even though it would be unrealistic