i think District line should be a route to come in TSW. But you could make it in the 1990’s cause Dovetail does that.The District line is 40 miles The District line goes west to east and to Wimbledon and Edgware Road and Richmond Terminus stations: Ealing Broadway Richmond Edgware Road Earls Court Wimbledon Tower Hill Upminster Depots Upminster depot Ealing depot The District line uses the D78 stock And the C stock Map
Why the 1990's? Personally I would rather see the line in 2015-2017 so both the D Stock and S stock can be featured.
Because dovetail currently are slowly moving trains into modern day And also I made a 2016 period proposal too If you scroll down you’ll see it