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Originally, it would've been because the models were too expensive to produce, and the spotlight on the Culdee Fell engines would take away from the primary Thomas cast. In later years, it was mainly because the TV series as strayed away from the books. Also, since there are only four stories involving the CFR engines, it would be a waste of money to pay so much for only a few episodes. With CGI now available, bringing in the Mountain Engines isn't impossible, but unless HiT tries to bring Thomas back to his roots, it's not likely.

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