The Night Riviera would be great, but I think it would be better suited to a Riviera Line route. Even though JT proved that it is possible to have the whole route the Night Riviera runs on - from Paddington down to Penzance - in TS201X with their Western Mainlines Addon, I'm not sure Dovetail would extend the Great Western express route that far, or at least not without a few route extension addons. That being said, I really hope the route from Bristol Temple Meads into Devon and Cornwall does get represented at some point - most of the 165s and 166s operate on the Severn Beach Line and neighbouring lines now, and they're already represented in TSW.
