Rusty is a Diesel who does maintenance work on the Skarloey Railway.
Rusty was built by Ruston and Hornsby Ltd. in Lincoln, England. He was bought by Sir Handel Brown direct from the builders in 1957 to assist Sir Handel and Peter Sam. While they handled passengers and goods, Rusty was paired with the chief mechanical engineer Mr. Ivo Hugh to repair the aging trackbed along the line.
When Sir Handel pretended to be ill, Rusty was asked to assist Peter Sam with the Slate Trucks and later that day had to perform a rescue operation at the Skarloey Railway Slate Quarry when Peter Sam had an accident on the incline.
Following the return of Skarloey, Rusty was put back on maintenance duties, but had an argument with Duncan about taking care on a "bad bit" of track south of Cros-ny-Cuirn. While initially refusing to help the conceited Duncan when he derailed, Skarloey reminded Rusty of his responsibility towards the passengers and he set out at once, later making up the quarrel with Duncan. Later that year, Rusty and Mr. Hugh were chosen to demonstrate to a television crew how they maintained the line at Quarry Siding.
In 1961, Rusty and Mr. Hugh discovered a washed out section of track south of the tunnel and the railway was closed temporarily while he and the workmen repaired the line. He was later present when Rheneas finally returned home.
In 1964, the Lakeside loop line extension was opened in a grand ceremony at Quarry Siding. Rusty was asked to bring visitors to celebrate the occasion.
In 1995, Rusty was put in charge of the weedkiller train, a job he disliked because it required slow speeds. The weedkiller later created trouble with Rheneas, who couldn't get a firm grip on the wet, greasy rails. He later had to take Sir Handel's trains after Sir Handel had caused his firebars to collapse. Rusty was present during Ivo Hugh's naming ceremony, and showed great delight upon learning that his co-worker, Mr. Hugh, was chosen as the engine's name.
Rusty, along with Skarloey and Rheneas got chased by Boulder, which had escaped from a cliff. He warned Duncan about the Old Wooden Bridge, who took notice. In result, Rusty had to rescue him from falling into the river. Rusty was taking workmen around to put up direction signs for hikers to see, but rushed them, in result of all the hikers going the wrong ways.