There is a loop line that goes from Tidmouth through Elsbridge to just east of Crosby. It was first completed in the sixth series episode, Edward the Very Useful Engine, when Sir Topham Hatt asked Edward to help Stepney run it.
Stations and Operations
The line begins on Duck's Branch Line near Tidmouth and heads east to Callandale and Callandale Fishing Yard and then through a tunnel to Elsbridge where it junctions with Thomas' Branch Line. It turns southward and passes the Sodor Construction Company Yard, a windmill, Elizabeth's Shed and the Coal Hopper before ending east of Crosby on The Main Line.
No certain engines have been known to work this line consistently, even though Thomas, Edward, Percy and Stepney have been known to work on the line. Also, many engines have been seen at the Coal Hopper.