This Heritage line would be perfect of TSW as its the 3rd longest Heritage line in the UK. It has a good selection of STEAM trains and diesel locos too. After all TSW is lacking in the steam department. Starting at Pickering working our way to to Whitby via Levisham, Goat Head, Grosmont and other smaller stops. It has challenging gradients and weather to give you the perfect experience. Here their current Steam fleet to choose from: https://www.nymr.co.uk/Pages/Category/steam-locos And their Diesels too: https://www.nymr.co.uk/Pages/Category/diesel-locos It has good selection of Steam and Diesels and it would give this route a lot of scenarios.