Frank is a small diesel engine who works on the Arlesdale Railway.
- Season 1: - Lift Bridge (episode), Stepney Makes an Entrance, Search Party, Sidney (episode) and Conspiracy Theory (stock footage, cameo).
- Season 2: - Mavis and the Tornado,
Livery and Basis
Frank is painted grey with red linings with is nameplate in red with "Frank" written in yellow. He is based on the Revenglass and Eskdale Railway Perkins.