The main colours of Castle Rock Colliery are mainly red with yellow lining. Locomotives often wore Wasp Stripes too.
The colliery was never absorbed by the NCB and ran until the 1940s. A W4 Peckett loco was abandoned in the engine sheds since nobody bought it when the colliery closed down. The little 0-4-0 was eventually barricaded inside the shed by a fallen tree until volunteers came to restore the colliery. The loco wasn’t in too bad shape despite where it was left and was returned to steam only four years later. The loco has never left the colliery’s boundaries since it was brought there fresh from the works in 1890.

Heres a coloured in outline I found of a W4 as a basis when I model the loco. I hope the creator of this outline is ok with me using it.