The Island of Sodor isn’t all flat land and countryside, there are mountains too. The trains of one railway are dedicated to traveling the narrow bends and sharp curves of those mountains. Culdee works for The Culdee Fell Railway, and that’s how he got his name. Chugging along slow and steady, Culdee is always ready to give advice to other engines on the mountain. Culdee’s two faces at either end of his body keep him alert to the dangers lurking in the mountains. His bright purple tank with red stripes makes him stand out among the trees. A sensible mountain railway train, Culdee pulls a forklift and apple car cautiously behind him.

Charlie and Culdee are purple

http://en.wikipedia.org/wiki/Culdee contains a fair amount of information regarding the "Cele De" under the English version of their name. Also, see discussion of this answer

http://en.wikipedia.org/wiki/Culdee contains a fair amount of information regarding the "Cele De" under the English version of their name. Also, see discussion of this answer

T. V. Moore has written:

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