Pierce Brosnan ( UK/US guest narrator for The Great Discovery and the original cut of Series 12; 2008) Inspired byBrerdaniel'sMy Little Pony: The Disney Chronicles poster, I've thought I make own Disney Adventure Poster. This time with Thomas the Tank Engine and his friends and it won't be just Disney and Pixar, but also Star Wars, Marvel, the Muppetsand 20th Century Fox too. If anyone ask about i'm planning to do the stories of them, well I might. But it's only a poster anyway.

Mark Moraghan ( UK/US narrator for Series 17–21, re-dubbed one Series 13 episode, two Series 14 episodes and two Series 15 episodes; 2013–2018)There are no characters that have appeared in every episode of the series, not even Thomas himself. However, the narrator seems to have lines in every single episode, despite not technically being a character. When the television series returned in 1991 with the third series, there were some big changes. Instead of following closely to the Railway Series, Allcroft and Mitton loosely adapted many of the Reverend's stories as well as loosely adapted magazine stories written by the current head writer Andrew Brenner (who unfortunately did not get credited for these adaptations), they even wrote their own episodes, much to the Reverend's disdain. The fourth series, airing in 1995, only had one original episode however and featured many new characters such as the Skarloey Railway engines.

Thomas, Edward, Henry, Gordon, James, Percy, Toby, Annie, Clarabel, and Sir Topham Hatt are the only characters who have appeared in every series of the show, all of whom except Annie and Clarabel also had a speaking role in each series. Out of all of them, Thomas, Henry, Gordon, and James are the only characters who have appeared in every special. In addition, Thomas, Henry, and James are the only characters to have at least one line of dialogue in every special. Wales: Tomos a'i Ffrindiau, narrated by John Ogwen and often broadcast on S4C's "Planed Plant Bach" By October 2020, Mattel announced their collaboration with Corus Entertainment's Nelvana Studio to produce a full on 2D animated reboot titled 'Thomas & Friends: All Engines Go' which was broadcast during the autumn of 2021, and taking a completely different direction from the original show, while a live action and animated hybrid theatrical film is set to be directed by Marc Forster.In February 2012, it was announced that Arc Productions would take over animation duties starting with the seventeenth series in 2013. In August 2016, Arc Productions closed down after filing for bankruptcy. Jam Filled Entertainment, however, entered into an agreement, looking at acquiring the entirety of Arc. On 22nd August 2016, it was confirmed that Jam Filled Entertainment had successfully acquired Arc Productions and thus taken over the animation for Thomas & Friends. Japan: きかんしゃトーマス ( Kikansha Tōmasu), broadcast on Fuji Television (Series 1–8), TV Tokyo (Series 9–11, 13) and NHK (Series 14–24)

One of the most revolutionary steps in the show's history also took place in 2008, when it was announced that Thomas & Friends would be produced using computer generated imagery (CGI). The show would be produced in Canada at Nitrogen Studios and the twelfth series used CGI for the faces of the engines, the people and the animals alongside the traditional live-action format. This was also the first series to contain twenty episodes and this format continued until the seventeenth series. saw the broadcasting of the ninth series as well as the release of the first direct-to-DVD special, Calling All Engines! The tenth series aired in 2006 and was the only production to contain twenty-eight episodes unlike the usual twenty-six. The first broadcasting of the eleventh series took place in 2007 and this marked the final series to contain twenty-six episodes, until the seventeenth series. The second direct-to-DVD special, The Great Discovery was released in 2008 and this marked the final full live-action production.

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By now, the series was doing incredibly well and a full-length theatrical film soon loomed ahead. Britt Allcroft decided to drift completely away from Railway Series stories and in 1998, the fifth series, contained all original storylines, allowing Britt to showcase the series as her own before the upcoming film.

The first fully CG animated production was the 2009 direct-to-DVD special, Hero of the Rails, directed by Greg Tiernan. This was also the first time the engines and people had individual voice actors since Thomas and the Magic Railroad. The voice acting continued for all series and specials hereafter. During the celebrations, Thomas and the Royal Engine was shown with a live-action introduction of Prince Harry followed by the twenty-fourth series and Marvellous Machinery, which marked the final productions for the original television series by a grand total of 584 episodes, 13 feature length specials and a theatrical film. In January 2016, three more episodes from the nineteenth series aired in the UK, followed by another five episodes in March 2016. March 2016 also saw the release of six more nineteenth series episodes released on the annual mini-tentpole, episodic release, Start Your Engines!. These episodes later aired in the UK in July 2016. A special 4-D theme-park exclusive production was released titled Thomas & Friends in 4-D: Bubbling Boilers on April 9, 2016 in Boston. Thomas & Friends celebrated their 70th Anniversary in 2015. To celebrate this milestone, a 44-minute special, The Adventure Begins was released in Spring 2015, the first feature to include original stories by the Rev. W. Awdry since 1995. Furthermore, a special 28-minute documentary, titled 70 Years of Friendship was released exclusively on the Thomas & Friends YouTube channel on 14 July 2015. In Autumn the same year, the next direct-to-DVD special, Sodor's Legend of the Lost Treasure, was released. The first four episodes of the nineteenth series premiered in the UK between 21 September and 24 September 2015. The nineteenth series also first aired on 13 October 2015 in the US.In 2017, it was revealed that the series would be undergoing a drastic revamp. The name of the series was changed to Thomas & Friends: Big World! Big Adventures! beginning with a special of the same name, which was released theatrically in the UK in the summer of 2018. The movie and the first half of the twenty-second series revolve around Thomas travelling the world and learning about different cultures, while the second half takes place on Sodor. The theme song was changed to Big World! Big Adventures!, the visuals became faster-paced, there is a greater emphasis on comedy and action, animals became a more prominent feature of the stories, and fantasy sequences became more prevalent, with at least one fantasy sequence in every episode. The show no longer features a narrator at all, replaced with Thomas speaking to the audience. Additionally, it was revealed that Edward, Henry, and Toby would be removed from the Steam Team, while the former two would be replaced with new female engines named Nia and Rebecca in an effort to bring the gender ratio among the main cast to a 50/50 split. It was announced that the episodes' runtime would be split into 7-minute stories (shortened from the 9-minute time slot used from series 13-21) and 4-minute segments featuring songs, puzzles, and other activities. These changes were made in an attempt to keep Thomas & Friends relevant by making it more similar to other preschool shows.