Thomas the Tank Engine Wikia
This article is about the Pack vehicle. You may be looking for the Story Library book, the little boy, the headkeeper or the other little boy.

“It's off to the works with you tomorrow, Jack. The Pack can't have a front loader with bent arms."
"You mean, I can STAY?!"
"I wouldn't have it any other way.”
―Jenny Packard welcomes Jack to the Pack[src]

Jack is a friendly and enthusiastic front loader who works for the Sodor Construction Company. He is Alfie's best friend.


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 was able to get off it, 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. Not wanting to be sent back to the yards, he left the mess not knowing that Ned had been blamed for it. Ned was about to be sent back to the yards when Jack admitted that he was the one who broke the slate, so Miss Jenny sent him back instead. Later, when Max and Monty carelessly crashed into the lightning tree, Alfie, Oliver and Kelly held the tree up while Jack ran to Thomas for the props. Luckily, he made it in time, and the tree was 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 started to collapse.

He also helped with the construction of the Harwick Branch Line, along with Alfie, Oliver, Max and Monty and later attended the branch line's opening ceremony.

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.

After James' accident at Tidmouth Sheds when his brakes malfunctioned, Jack assisted with the shed's reconstruction.


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, or when he rescued Thomas and Stephen. He is also kind and caring but tends to be rather impulsive. Despite being one of the younger members of the Pack, Jack has the makings of a good leader. He can also be a bit panicky like when Monty fell down into a mineshaft.

Technical Details


Between the sixth and twelfth series, Jack was based on a Nuffield tractor with an added front loader.

Since the special, King of the Railway, Jack was designed as 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.


Thomas & Friends

Jack had a role in the cancelled episodes, Jack's Snow Rescue, Bossy Byron, The Importance of Being Patrick, Jack and the Quack, Pop Goes the Diesel, Alfie Has a Secret, Isobella Gets Steamed and Grass is Greener.


Music Videos


Official Description

From Official Media[1]

Jack: Jack is the friendliest front loader the island has ever seen. Jack and his construction crew work on projects all over the Island of Sodor. Jack loves his job and is so eager to please that he often takes on tasks he probably shouldn't. Check out the time when Jack had to be reminded of the quarry motto - 'safety first'.

From Official Website[2]

Jack: Jack is the friendliest front loader the Island has ever seen.

Fun Fact: Jack loves his job so much and is so eager to please that he often takes on tasks he probably shouldn't.

From Official Website[3]

Jack: Jack is the friendliest front loader the island has ever seen. Jack and his construction crew work on projects all over the Island of Sodor. Jack loves his job and is so eager to please that he often takes on tasks he probably shouldn't.

Fun Fact: Jack's job when he first arrived on Sodor was to clear room for railway lines.

Audio Files


First used Last used Sound Effect
Jack and the Sodor Construction Company The Great Discovery


  • 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 wells were moved back.
      • The tread patterns on his tyres changed slightly.
      • The colour of his alloys also changed from cream to grey.
      • His roof became completely orange.
      • His number increased in size.
      • His bucket increased in size.
      • The colour of his cab changed from cream to white.
      • His wipers were removed.
  • 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.
  • Jack's Trackmaster Push Along toy lacks his number, his larger wheel is also sized down.
  • Jack is the only character to have his face change shape over the course of the series.
  • Jack had a total of fifteen facial expressions, five of which (confused, drowsy, intrigued, anxious and yawning) were not used on-screen.[2]
  • According to Meet the Characters!, Jack is now the leader of the Pack likely due to Kelly not returning in CGI.
  • Jack shares his name with Hilary Fortnam's grandson. Fortnam was the youngest daughter of The Railway Series creator Wilbert Awdry.
  • Jack's horn sound is similar to Caroline and Bertie’s current horn sound. It was reused for Brum in The Adventures of Brum, Dodger in Bob the Builder: Project Build It and for PUTT-PUTT in the computer game series "PUTT-PUTT" developed by Humongous Entertainment.
  • Jack is the only Pack member, as well as the only character introduced in the sixth series, to be made into the Thomas Engine Collection Series range. He was also the last character to be made into the aforementioned range.


"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 series



Non-rail vehicles

* RWS only | ** T&F only | *** Other Media only