This route would stretch the whole length of the SWML incorporating the bustling suburbs of South West London + The stunning natural beauty of the New Forest + The coastal areas around Poole and Weymouth. The route would be set in the present day and would include the Class 444, Class 450, Class 442 and Class 455. Extra DLCs could include the class 158/159 and the Alton Line. I think this route would be great in TSW2
You are unlikely to get the full length of the route in TSW2. Best to pick a 50 or 60 mile section, which is more realistic for DTGs route builders and the game engine capability. Personally I would go with Southampton to Weymouth but it would have to include the Quay line...