On the portsmouth direct line if dtg were to add this into the game the route would most likely would be released with the class 444, class 450 and the class 455 The class 450 and class 444 would most likely be used by players to operate a London waterloo to portsmouth Harbour service. There would also be services to Salisbury, Exeter, Weymouth and Basingstoke, but this will only go as far as Woking due to the portsmouth direct line splitting of the SWML. The class 455 would use stopping services such as Waterloo to Guildford, and Waterloo to hampden Court via Wimbledon With this route there could be a wide variety of scenarios such as a Wimbledon tennis day train or just terminating at portsmouth and Southsea due to works at portsmoutth Harbour. Dtg could also layer class 377 services and 166 services but I doubt they would do that on release Please like this post to show dtg you want this route.
I'm not the biggest fan of self-promoting however I suggested this route in this thread: https://forums.dovetailgames.com/th...ine-london-waterloo-portsmouth-harbour.39162/