This is a DB non electric route running from Elmshorn to Tender, With a branch to Westerland. This route is 211 kilometers or 131 miles long. This is a main line handles fast ICE trains, regional trains, and local and freight trains. This route runs through the marshes of north Germany. This route offers a large number of unique services with 45 stations and multiple connections to others rail lines. This rail line spans two countries.
Perhaps for TSW3 the route can be shortened and goes from Husum to Westerland, with the beanch line to Dagebüll Kirche. With this the IC cab car can added and the cars can split, whereby a part can be coupled to the BR628 to Dagebüll. Just as idea, but more realisable.
I think that would be a good idea, except I think it would be fun if the route featured the paper mill in glückstadt, and the mine in längedorf for more varied freight operations. Maybe the route could be shortened to not include the branch to tønder.
