Mentioned locomotives

In the whole "Through the Valleys" series, there are a number of mentioned locomotives, most were scrapped.

Furness Railway K2
The Furness Railway K2 is a 4-4-0 that Darren mentions when he worked for the LMS.

Bio
Little is known due his identity unknown. According to Darren, he met the K2 at Barrow-in-Furness in 1931, before he was withdrawn and scrapped. Darren had forgotten the number of the engine as he only met him once before.

Basis
It's unknown where Darren's account is based upon since no LMS 2P has been known to got to Barrow-in-Furness before 1931.

Livery
The Furness Railway K2 could have been painted in either LMS Crimson Lake or LMS Lined Black.

Trivia
Edward of the NWR is a member of this class, but much rebuilt.

NER Class 290
The NER Class 290 was an old tank engine around the size of Billinton that Max met during a visit to Bishop Auckland in 1953. According to Max, this engine had a bicycle in front of his face.

Bio
Because this is a mentioned engine, he is never seen in the series.

Basis
It's possible that this character is based off a photograph of BR No: 68391 at the location mentioned by Max in 1953. The photo shows the locomotive carrying a bicycle in front of its smoke box.

Livery
The NER Class 290 could have been painted in BR Unlined Black with Early Emblems or Late Crests.

Cadbury Castle
Cadbury Castle is a GWR Castle class 4-6-0 that worked with Swithland Hall remembers from her service days in the Western Region.