Workshop Engines

Percy's companions
These engines only appeared in the workshop where Percy lived in "Troublesome Engines". They are described as looking "big, little, happy, sad and anxious". The first looks like a black version of James, the second is a blue 4-4-2 tank engine with the same face as Thomas, the third is a red 4-6-2 resembling Gordon and the fourth is a green 4-4-0 tender engine that looks a lot like Edward.

In addition to these in "My Thomas Story Library", there are two other engines; one looks like a maroon version of Percy with yellow stripes and inside cylinders and other looks like Wilbert with blue wheels.

Edward's companions
Two other engines appeared in the comic "Chiff Chaff" when Edward went to the works. The first one is a green tender engine with green smoke deflectors, possibly an LMS Royal Scot; the second is a silver electric tram engine. The eyes of another engine were visible.