A Caterpillar Crane is a mobile crane that runs on caterpillar tracks, many caterpillar cranes can be seen all around Sodor and mostly work in quarries and other worksites. Some scrapped cranes have also been seen several times.
The Ertl toys of the caterpillar cranes incorrectly refers to them as a "he" as if there is only one of them and as if they are sentient.
During filming of Thomas and the Magic Railroad, a slightly new model was made to replace the original model that was used from the third to the fifth season, likely due to damage sustained while being shipped to Canada. However, the model from the film was possible lost or damage while being shipped back to England, so the crew made a scrapped model during filming of Series 7.
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