Can i suggest the Bristol to Severn Beach route, you could also extend to the old Portishead line, pretty route with the Clifton Suspension bridge, also some scope for Haulage around Avonmouth Docks Would be good for Bristol to be featured in the sim
Look here for Bristol-Severn beach. Also on their site is Bristol-Exeter and a lot of West Country routes. https://www.justtrains.net/product/bristol-avonmouth-download On Steam/DTG is Bristol-Cardiff, South Wales Coastal.