Jack

A friendly and enthusiastic front loader. Jack was first seen in the episode 'Jack Jumps In' when he joined the Pack. Despite a couple of accidents, he was able to prove himself when he saved Thomas from disaster, and is now part of the team. Jack is painted red and has the number 11. In some promo sketches of the Pack characters seen on a Japanese website, Jack is seen with a backhoe arm and bucket, most likely drawn before it may have been removed from the model to avoid any more likeness to Scoop from Bob the Builder.

It is unsure of what type of vehicle Jack is based off, although he does resemble a Nuffield Tractor.