Fred is a narrow gauge diesel engine who works on the Skarloey Railway.
The Skarloey Railway bought two worn out Hunslet diesels from the National Coal Board and using parts from both engines, constructed Fred. He was put into service in 1989 as a secondary diesel and is used mainly for maintenance and engineering work.
Once a year, Rusty and Fred have to pull a slow train that spreads weedkillers on the tracks. One holiday weekend, Fred was supposed to pull the weedkilling train, but fell ill, forcing Rusty to do the job instead.
Very little is known about Fred. It is assumed he is lazy and tries to stay out of work by pretending to be ill, but it is possible that he legitimately does fall ill often.