Fred (full name Frederick) is a diesel working on the Skarloey Railway. He speaks with a Welsh accent. He was built at Hunslet Engine Co. in 1950.


According to Sodor: Reading Between the Lines, 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, and is used mainly for maintenance and engineering work.


It is assumed Fred is lazy and tries to stay out of work by pretending to be ill.


Fred is based on Alf, a Hunslet 0-4-0 diesel with a maximum speed of 9 mp/h working on the Talyllyn Railway.


Fred is painted charcoal-black with yellow lining and white lettering.