Series 1 (All Engines Go)

The first series of Thomas & Friends: All Engines Go premiered on Cartoon Network's Cartoonito block on 13th September 2021 and on Netflix on 29th October 2021 in the US, while the series premiered on Milkshake! in the UK on 8th November 2021, on ABC Kids in Australia on 3rd January 2022 and on Nick Jr. in the UK and Ireland on 16th May 2022.

Production
In 2020, Mattel Television announced a new co-production partnership with Corus Entertainment's Nelvana Studio. 104 11-minute episodes and two 60-minute specials were greenlit for the “Thomas & Friends” television series over two seasons. The new format will feature "a new look and story structure", original songs and Thomas as the lead character of every episode.

Instead of being released all in one go, Series 1 was split into two parts, each containing twenty-six episodes. The first part was released in the US between September and December of 2021, while the second was released between January and July of 2022, although these release dates vary in other countries.

Before the series had an official title, All Engines Go Series 1 was commonly referred to as Series 25, in line with the numbering of the original twenty-four series of Thomas & Friends. This error carried over into some promotional material and marketing. The series' head writer, Rick Suvalle, has since confirmed that these were only working titles for the series during its production, as it takes place within an entirely different continuity.

Description
All aboard the highly anticipated Thomas & Friends: All Engines Go! The Island of Sodor is home to the biggest, silliest, most musical and toot-ally awesome-est adventures with your number one pal, Thomas the Tank Engine. With an amazing new animated look, Thomas is joined by a wonderful group of familiar friends, including Percy, Diesel, Gordon, Nia and Sir Topham Hatt. There are fresh faces too, like the island's finest fix-it crew, Carly the Crane and Sandy the Rail Speeder.

Returning Characters

 * Thomas
 * Gordon
 * James
 * Percy
 * Emily
 * Yong Bao
 * Nia
 * Diesel
 * Carly
 * Kenji
 * Troublesome Trucks
 * Annie and Clarabel
 * Harold
 * Bulstrode
 * Cranky
 * Skiff
 * Sir Topham Hatt
 * Farmer McColl
 * Edward
 * Henry
 * Hiro
 * Whiff
 * The Big Mean Engine

Characters Introduced

 * Ultratrain
 * Trainiac
 * Sandy
 * Kana
 * Boxy
 * The Itsy-Bitsy Speeder
 * The Purple Tender Engine
 * Rolf's Castle Knight
 * Farona and Frederico

Locations

 * Island of Sodor
 * Blue Mountain Hills
 * Brendam Docks
 * Sodor Shipping Company
 * Cannonball Curve
 * Duck Pond
 * Harwick
 * The Hat Store
 * The Mail Depot
 * High Desert
 * Crumble Canyon
 * The Old Mines
 * The Crystal Cave
 * Kirk Ronan
 * Rolf's Castle
 * Rolf's Castle Tunnel
 * Knapford
 * The Maintenance Yard
 * Lookout Mountain
 * McColl Farm
 * Norramby Beach
 * Peel Godred
 * Quickdraw Bridge
 * Sodor Wildlife Sanctuary
 * Steep Hill
 * Suddery
 * The Broken Bridge
 * The Bumpy Track
 * The Cliffside
 * The Dark and Windy Tunnel
 * The Dark Woods
 * Crovan's Creek
 * The Wobbly Bridge
 * The Funnel Tunnel
 * The Tight Bend
 * The Tunnel of Zoom
 * The Windmill
 * Tidmouth Sheds
 * Vicarstown
 * Vicarstown Bridge
 * Vicarstown Lighthouse
 * Vicarstown Museum of History
 * Vicarstown Theatre
 * Wellsworth Crossing
 * Whiff's Recycling Plant
 * Whistling Woods
 * Wellsworth
 * The Mainland
 * Wayland
 * China
 * Kenya

UK

 * Aaron Barashi as Thomas
 * Will Harrison-Wallace as Gordon, Cranky, and Bulstrode
 * Luke Marty as James
 * Tom Dussek as James and Sir Topham Hatt
 * Henri Charles as Percy
 * Marie Ekins as Emily
 * Lobo Chan as Yong Bao
 * Sade Smith as Nia
 * Cory Doran as Ultratrain and Trainiac
 * Jai Armstrong as Ultratrain, Trainiac , the Troublesome Trucks, Skiff and Harold
 * Henry Harrison as Diesel
 * Eva Mohamed as Carly
 * Holly Dixon as Sandy
 * Kintaro Akiyama as Kenji
 * Chloe Raphael as Kana
 * Catherine Disher as Annie
 * Linda Kash as Clarabel
 * Wendy Patterson as Annie and Clarabel
 * Bruce Dow as Sir Topham Hatt

US

 * Meesha Contreras as Thomas
 * Neil Crone as Gordon
 * Luke Marty as James
 * Charlie Zeltzer as Percy
 * Kayla Lorette as Emily
 * Patrick Kwok-Choon as Yong Bao
 * Talia Evans as Nia
 * Cory Doran as Ultratrain, Trainiac, the Brown Troublesome Truck and Cranky
 * Shomoy James Mitchell as Diesel
 * Jenna Warren as Carly
 * Glee Dango as Sandy
 * Kintaro Akiyama as Kenji
 * Ava Ro as Kana
 * Catherine Disher as Annie
 * Linda Kash as Clarabel
 * Jamie Watson as the Green Troublesome Truck, Bulstrode and Skiff
 * Bruce Dow as Harold and Sir Topham Hatt

Trivia

 * This series marks the first of several things:
 * The first series animated exclusively in 2D by Nelvana Studio.
 * The first series in which drivers and firemen are not present.
 * The first series to have no narration.
 * The first series in which vehicular characters have coloured irises.
 * The first series in which Thomas is the lead character of every episode.
 * The first series in which Edward and Henry do not have speaking roles.
 * The first series where Sir Topham Hatt is not referred to as the Fat Controller in the UK dub.
 * The first series since the twenty-first series not to fall under the Big World! Big Adventures! subtitle and take place entirely on the Island of Sodor.
 * The first appearances of:
 * Bulstrode since the fourth series of the original television series.
 * Kirk Ronan since the fifth series of the original television series.
 * Rolf's Castle in an episode.
 * Norramby Beach since the tenth series of the original television series.
 * Peel Godred since the eleventh series of the original television series.
 * Both the first and second series of All Engines Go contain 52 episodes each, making them longer than the longest series of Thomas & Friends (the tenth and twentieth series, both featuring 28 episodes respectively).
 * Toby and Rebecca are the only members of the old and new Steam Team respectively not to appear in the series.
 * This is the only franchise season to date to not feature Toby.
 * According to producer Rick Suvalle, there were plans for Whiff to make a physical appearance in the first series, however these never came to fruition.
 * For unknown reasons, the series was split into two different series on Netflix in the US, but this was later corrected.
 * The Estonian, Latvian, Lithuanian and Baltic Russian dubs are voiced over the British English dubs.
 * The theme song was dubbed in Latvian and Lithuanian but it was voiced over the British English dub and the voice actor reads the lyrics only. Additionally, the theme song was never dubbed at all in Estonian, Baltic Russian, Albanian and Persian dubs of the series.
 * In South Korea, the theme song and credits were aired on television only and were never released on VOD.
 * In Australia and New Zealand, episodes 27 - 40 aired with slightly pitched-up audio.