Jock the New Engine is the fifth episode of the Arlesdale Adventures miniseries.
Bert lets the others in on a secret. A few weeks later, an unnamed engine, who is ochre in colour, comes out for testing. When Douglas sees the engine, he recalls some engines in the Highlands with that colour who were called "Jocks". The engine is delighted, and the happy Small Controller christens the engine "Jock".
- Going by production order (release date), this is the third episode of the Arlesdale Adventures miniseries.
- This episode is an adaptation of the story "Jock" from the Railway Series book Jock the New Engine
- This is the first episode to be an adaptation of a Railway Series story instead of a television series episode, with the second being the Sodor Stories episode Donald and Douglas.