Crawler tractors are scoop tractors that are owned by some workmen. They are used at the quarries to dig as well as lift and push rocks. Occasionally, they can be seen at Knapford Harbour. Once, one was part of a convoy that helped restore power to a village on Christmas Eve.
Crawler tractors are based on a 1934 vintage Caterpillar Model 70 - the largest, and last, design of petrol-powered tractors in Caterpillar's range. Terence is another member of this class.
Crawler tractors are mostly painted grey or light brown. One was painted yellow in Christmas Crisis.
- Season 3 - Gordon and the Famous Visitor, Diesel Does it Again, No Joke for James, Toby's Tightrope, One Good Turn and Heroes
- Season 5 - Bye George!
- 1998 - Christmas Crisis (front loader)
- The crawler tractor's model was recycled from Thomas & Friends' sister show, TUGS.