A nice long route would be great for this game. There's good options for freight and a mixture of service's from SWR and GWR and even the odd cross country service. Please do add request stops such as Dilton marsh along this route.
Just incase you haven't seen. Took awhile updating the proposal https://forums.dovetailgames.com/threads/wessex-main-line-dilton-marsh-bristol-to-salisbury.23130