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Jack is a friendly and enthusiastic front loader, who works for the Sodor Construction Company.
Thomas & Friends
When Jack first arrived on Sodor, he worked with the Pack to clear room for railway lines. Jack did well with Alfie - that is, until he tried to take some stone up a ledge but failed to pay attention to where he was going and accidentally drove onto an edge of a hill and tipped over. After Miss Jenny scolded him as soon as he was put back on four wheels, Jack learned his lesson and redeemed himself by holding up a collapsing bridge until Thomas had passed over, at the cost of damaging his arms. Jack has since become part of the Pack.
When Jack was being careless again at the warehouse, he accidentally knocked over some slate, but he did not want to be sent back to the yards and left the mess not knowing that Ned was running over pieces of it and blamed for it and was about to be sent back to the yards, until he heard from Alfie and admitted to Miss Jenny (who was angry at him again) that he broke the slate and was sent back to the yards. Later, when Max and Monty carelessly crashed into the lightning tree, Alfie, Oliver and Kelly hold the tree up while he goes to Thomas for the props and the tree is saved.
He, along with the rest of the Pack, helped with the restoration of Great Waterton and worked with Alfie to build a bandstand there. Jack also helped with the restoration of Ulfstead Castle and later saved Stephen and Thomas after the tracks they were on collapsed.
Later he, Alfie, Oliver, Max and Monty were working on Thomas' Branch Line and he, Oliver and Alfie helped clear the branch line around the Rail Under Road Bridge and Signalbox after Max and Monty dumped their loads on the line.
Jack is brave and will not take any hassle, as seen whenever he stands up to Max and Monty when they bully him and Alfie. He is also kind and caring, he also likes to jump in and get the job done even with other jobs that the other vehicles are assigned to do. But despite the fact that he was trying to be helpful and mean well, he has learned from Ms. Jenny's words, to not jump into another job that is not his own.
It is unclear what type of vehicle Jack is based on, but between the sixth and twelfth seasons he seemed to resemble a Nuffield tractor with an added front loader.
Since the special, King of the Railway, Jack's basis has closely resembled an International 454 tractor. Because of this, his face shape has changed dramatically from round to rectangular.
Jack was painted red with the top half of his cab and his wheels painted cream. He had the number 11 painted in cream on his sides. From King of the Railway onwards, the top half of his cab and his number are painted white, his back wheels are painted grey and his front wheels are painted red.
- Steven Kynman (UK; King of the Railway onwards)
- David Menkin (US; King of the Railway onwards)
- Tim Kreuer (Germany; King of the Railway only)
- Daniel Schütter (Germany; Sodor's Legend of the Lost Treasure onwards)
- Naomi Shindō (Japan; sixth season only)
- Hideki Nakanishi (Japan; The Great Discovery - twelfth season)
- Keiko Nemoto (Japan; King of the Railway onwards)
- Artur Pontek (Poland)
- Yannick Blivet (France and French speaking Canada; Sodor's Legend of the Lost Treasure onwards)
- Gilan Shachaf (Israel; Sodor's Legend of the Lost Treasure and King of the Railway only)
- Paul Disbergen (The Netherlands)
- Scott Maurstad (Norway; King of the Railway only)
- Nacho Rodríguez (Latin America; King of the Railway onwards)
- Mariano García (Spain)
- Joonathan Kettunen (Finland; King of the Railway onwards)
- In some promotional sketches of the Pack, Jack is seen with a backhoe arm and bucket. According to an SiF interview with Chris Lloyd, the arm was built, but was too problematic as it was hard to store all of the radio gear inside the model. An interview with Phil Fehrle gives a very different reason: "...if a story required Jack to be digging (using his back-hoe) and interacting with another character working at the same time, his face would be facing away from the action. For story purposes, it was important to feature the faces as much as possible; thus, the backhoe was removed".
- Jack has had a few modifications in the television series:
- King of the Railway:
- He gained hydraulics.
- His exhaust pipe became taller and gained holes on the sides, as well as a handle.
- He decreased in size.
- His face changed from round to square.
- His rear wheel cover was moved back.
- His tyres changed tread pattern slightly.
- The colour of his alloys also changed from cream to grey.
- His roof became completely orange.
- His number became bigger in size.
- His bucket increased in size.
- The colour of his cab changed from cream to white.
- King of the Railway:
- Nathan Clarke did an audio sample for Jack on his DAA Management Page.
- A semi-complete face mask of Jack was preserved by the Top Props preservation group.
- "Spot on, Jack! You'd make a mother proud!"
- "And a tank engine grateful!"
- Miss Jenny and Thomas praising Jack, A Friend in Need, sixth season
- ERTL (discontinued)
- Wooden Railway (discontinued)
- Take Along (discontinued)
- Take-n-Play (discontinued)
- TrackMaster (motorised and un-motorised)
- My Thomas Story Library (discontinued)
- Thomas Engine Collection Series (discontinued)
- Mini Die Cast Collection (discontinued)
- Thomas Town (discontinued)
- Capsule Plarail
- Pocket Fantasy (discontinued)
- Nakayoshi (discontinued)
- Adventures (sold only in Jack and the Pack 4-Pack)
- TrackMaster Push Along (coming soon)