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The following article is a list of characters from the British children’s series Thomas & Friends.
- Thomas (No. 1) is a blue tank engine of the North Western Railway. He initially worked as the station pilot at the Big Station. After helping to rescue James from an accident, Thomas was rewarded with two new coaches, Annie and Clarabel, and was assigned to the Ffarquhar Branch Line.
- Edward (No. 2) is a blue mixed-traffic tender engine. He runs his own branch line with BoCo. Edward is one of the oldest engines on Sodor and is occasionally made fun of for his age. After a berth at Tidmouth Sheds was destroyed, Edward moved to Wellsworth Sheds.
- Henry (No. 3) is a green mixed-traffic tender engine who works on the Main Line. He was originally a prototype engine that needed special Welsh coal to operate properly. Following an accident when pulling the Flying Kipper, Henry was rebuilt giving him a new shape and better performance, and eliminating the need for the expensive special coal. Henry moved from Tidmouth to Vicarstown Sheds in order to be closer to his work.
- Gordon (No. 4) is a blue express engine who works on the Main Line. He is Flying Scotsman's only surviving brother. Gordon is also one of the fastest and strongest engines on the Island of Sodor and his main task is to pull the Wild Nor' Wester, the railway's express train. At times, this leads him to feel superior. He is mainly used for passenger duties, but has occasionally pulled goods trains, much to his dislike, as he believes that these are below him.
- James (No. 5) is a red mixed-traffic tender engine who works on the North Western Railway, usually on the Main Line.
- Percy (No. 6) is a green saddle tank engine who was brought to Sodor to help run the railway during Gordon, Henry and James' strike. He is Thomas' best friend and one of the youngest engines on the North Western Railway and often gets into trouble with his attempts to play tricks on the other engines. His favorite job is to deliver the mail and he works on Thomas' Branch Line as a goods engine.
- Toby (No. 7) is a steam tram who works on Thomas' Branch Line with his coach Henrietta. Toby rarely has accidents.
- Duck (No. 8) is a green Great Western engine who runs his own branch line with Oliver. He thinks there are two ways of doing things, the Great Western way and the wrong way. Duck’s real name is Montague, but he is nicknamed Duck because he “waddles”. In season 8 of the series, he was originally considered to be part of the Steam Team, but was dropped out in favor of Emily.
- Donald and Douglas (Nos. 9 and 10) are twin black mixed-traffic Scottish tender engines. They tend to work together on the railway, although they can be argumentative.
- Oliver (No. 11) is a green Great Western tank engine. He and his brake van Toad were originally meant to be scrapped, but they were saved by the Scottish twin Douglas.
- Bill and Ben are a pair of yellow saddle tank engines owned by the Sodor China Clay Company. They are mischievous and love to play pranks on the other engines. The two work at the docks and the company's clay pits.
- Diesel is a black diesel shunter. Diesel has an oily, scheming and malicious nature and holds a grudge against steam engines. Despite this, he still desires to be a useful engine.
- Daisy is a green diesel railcar who first arrived on Sodor after Thomas crashed into the stationmaster's house on his branch line.
- BoCo (No. D5702)
- Mavis is a privately-owned diesel shunter who works for the Ffarquhar Quarry Company, based at Ffarquhar Quarry. She also works at the Sodor Slate Quarry.
- The City of Truro (No. 3440) is one of only two real-world tender engines to have appeared in the TV series, the other being The Flying Scotsman. He works on the mainland.
- Stepney (No. 55) is a tank engine painted Improved Engine Green who works on the Bluebell Railway. Rusty saved him from being scrapped.
- Class 40
- 'Arry and Bert are twin diesel engines who work at the Sodor Ironworks.
- Diesel 10
- Splatter and Dodge
- Salty (No. 2991) a diesel shunter who works at Brendam Docks.
- Harvey (No. 27) is a maroon crane tank locomotive. He is very cheerful and helps clean up after other engines' crashes.
- Emily (No. 12) is a green Stirling tender engine. She was the only female engine at Tidmouth Sheds before the arrivals of Nia and Rebecca.
- Spencer is the private engine of the Duke and Duchess of Boxford. He is very fast, which leads to a rivalry with Gordon.
- Rosie (No. 37)
- Whiff (No. 66)
- Hiro (No. 51)
- Charlie (No. 14) is a purple tank engine originally from England. He has a mischievous personality. 
- Bash and Dash
- Belle (No. 6120) is a blue tank engine that is part of the Sodor Search and Rescue Centre and has a loud bell and water cannons on top of her tanks.
- Flynn is a red fire engine that is part of the Sodor Search and Rescue Centre and operates as a road-rail vehicle, both on road and rail.
- Connor is a blue streamlined tender engine who comes from the mainland, along with Caitlin.
- Caitlin is a pink streamlined tender engine who comes from the mainland, along with Connor.
- Timothy is a blue oil-burning tank engine who works at the Sodor China Clay Company alongside Bill, Ben and Marion.
- Glynn (No. 1)
- Philip (No. 68)
- Ryan (No. 1014)
- The Flying Scotsman (No. 4472) is one of only two real-world tender engines to have appeared in the TV series, the other being The City of Truro. He works on the mainland. In Thomas & Friends: The Great Race, it is revealed that he is Gordon's brother.
- Nia (No. 18) is an orange tank engine who originally lived in Kenya before going on a world adventure with Thomas. When Thomas had to return to Sodor, she revealed she had no home to go to since her shed was destroyed, so Thomas invited her to live on Sodor, taking Edward's place at Tidmouth Sheds.
- Rebecca (No. 22) is a streamlined yellow tender engine who was originally from England. First introduced in season 22 of the series, Rebecca has taken Henry's place at Tidmouth Sheds. Rebecca is a very cheerful and uplifting engine.
- Skarloey (No. 1) is a red saddle tank engine and the oldest engine on the Skarloey Railway.
- Rheneas (No. 2) is a vermillion tank engine and the Skarloey Railway's second engine.
- Sir Handel (No. 3) is a blue saddle tank engine who lives and works on the Skarloey Railway.
- Peter Sam (No. 4) is a green saddle tank engine who lives and works on the Skarloey Railway.
- Rusty (No. 5) is an orange diesel engine. He carries out maintenance work and odd jobs around the Skarloey Railway.
- Duncan (No. 6) is a grumpy yellow Scottish tank engine who came to the Skarloey Railway as a spare engine after Peter Sam's accident with some slate trucks.
- Duke is an orange-brown tender engine, who is widely respected and considered a hero amongst all the engines. He is also one of the oldest engines on Sodor.
- Bertram is a dark brown tender engine who worked at the mines. He lived on a remote part of the Island that was once very rarely visited.
- Mighty Mac is a blue double-ended Fairlie duplex engine, and conjoined twins. Mighty is the "older" of the two and is distinguished by a small flick of hair. Mac is the "younger" half and is distinguished by his youthful features, round nose and freckled cheeks. Despite the opposing personalities of the two ends, they are technically one engine.
- Freddie (No. 7) is an old grey and black tank engine on the Skarloey Railway.
- Victor is a dark red Cuban tank engine (although he was built in the USA) who works at the Sodor Steamworks with his assistant, Kevin.
- Luke is a green Irish saddle tank engine who works primarily at the Blue Mountain Quarry, on the Skarloey Railway.
- Millie is Sir Robert Norramby's private blue French tank engine. She works on the Estate Railway.
- Smudger is an olive tank engine who used to work on the Mid Sodor Railway and was later turned into a generator due to his tendency to derail frequently.
- Proteus is a legendary yellow saddle tank engine with a magic lamp hung upon his funnel.
- Annie and Clarabel are Thomas' faithful coaches.
- Henrietta is a coach that travels with Toby, Victoria and Elsie. Percy or Daisy usually take her when Toby is absent. Thomas and Emily have also pulled her.
- Old Slow Coach is a Great Western Railway clerestory brake coach, known for her luxurious interior.
- Troublesome Trucks (also called Cars or Freight Cars, originally Foolish Freight Cars, in the US) are pieces of rolling stock that are nicknamed so because they can be very troublesome, and love to play tricks on the engines. They can be Open Wagons, Vans, Tankers or Brake Vans, depending on the type.
- Hector (acronym for "heavily engineered coal truck on rails") is a large coal hopper who is good friends with Thomas and James. He first appeared in the eleventh season episode "Hector the Horrid", and he also appears in the twelfth season episode, "James Works It Out".
- Toad is Oliver's loyal brake van.
- Bradford is Samson's trustworthy brake van.
- Rocky is a large red breakdown crane, who is part of the Sodor Search and Rescue Team.
- Judy and Jerome are the two large gray breakdown cranes on the Arlesburg Branch Line. They were originally stationed at Knapford Station.
The television series Thomas & Friends and the original Railway Series books are known for its anthropomorphic railway engines. This article lists the characters over the years that are not rail-based.
- Terence is an orange tractor fitted with caterpillar tracks.
- Bertie is a red bus who works near Thomas' Branch Line.
- Trevor the traction engine was due to be broken up before he was saved by the Vicar of Wellsworth.
- Harold is a white helicopter who patrols the skies of Sodor, nicknamed "whirlybird" by the engines.
- Bulgy is a bad-tempered double-decker bus. His favourite phrase is "Free the roads!".
- George is a green, grumpy steamroller. Whenever he is flattening a road, he is seen rebelling by saying "Railways are no good! Turn 'em into roads! Pull 'em up! Turn 'em into roads!".
- Cranky is a green tower crane who works at Brendam Docks.
- Butch (R.K. 03) is a yellow and navy blue breakdown vehicle.
- Elizabeth is a vintage Sentinel steam lorry.
- Jeremy is a jet plane who lives at the Sodor Airport, now discontinued in the US.
- Madge is a green and cream coloured snub-nosed lorry with a three-wheeled cab and a flatbed.
- Kevin is a yellow mobile crane who works alongside Victor at the Sodor Steamworks. Kevin's catchphrase is "It was a slip of the hook!"
- Captain is a blue, red and yellow coast guard lifeboat.
- Merrick is a sleepy, snoring gantry crane.
- Owen is a bright orange incline engine.
- Reg is a Diesel-powered rail-based grappling crane at Crocks Scrap Yard.
- Carly is a crane at Brendam Docks.
- Big Mickey is a large hammerhead crane who works at Brendam Docks.
- Beresford is a rolling gantry crane stationed on the Mainland. He speaks in a Jamaican accent.
- Ace is a race car.
- Cleo is a road engine.
- Caroline is an elderly automobile used by the cricketers on the Island of Sodor.
- Bulstrode is a self-propelled barge who worked at the harbour.
- Thumper is a quarry machine with two arms and caterpillar tracks.
- Tiger Moth is a red-and-yellow biplane first seen in Season 5.
- Colin is a stationary steam crane who works at the Wharf.
- Isla is an air ambulance.
- The Horrid Lorries are three lorries that came to Sodor to replace the engines, but were sent away following a series of accidents. All three are painted dark red and carry numberplates, which read "LOR 1" (L0R 1), "LOR 2" (L0R 2) and "LOR 3" (L0R 3).
Sodor Construction Company
In series 6, a new set of characters was introduced called "The Pack". The characters were devised by then-producer Phil Fehrle with the intention of being turned into a spin-off series, possibly as a rival to HIT Entertainment's other successful show and brand Bob the Builder. This spin-off series never materialised.
- Jack is a friendly and enthusiastic front loader.
- Alfie is an excavator.
- Oliver is an excavator.
- Max and Monty are devious and troublesome red Dump truck twins.
- Kelly is a crane truck and the oldest member of the Pack.
- Byron is a cocky, boisterous bulldozer with a big blade.
- Ned is a steam shovel.
- Isobella is a vintage lorry who looks almost identical to Elizabeth.
- Patrick is a boastful concrete transport truck.
- Buster is a simple steamroller.
- Nelson is a ballast tractor whose job is to haul construction workers and the Pack to and from work.
- Brenda is a bulldozer who was introduced in series 23.
- Darcy is a mole.
- "Ben - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- "Bill - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- "Diesel - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- "Stepney - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- "Harvey - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- "Charlie - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- "Rebecca - Engine Profile & Bio : Thomas & Friends". play.mattel.com. Retrieved 2021-02-06.
- Sibley, Brian (1995). The Thomas the Tank Engine Man. Heinemann. p. 143. ISBN 0-434-96909-5.
- "Kevin". thomasandfriends.com. Retrieved November 5, 2017.
- "Thomas & Friends: On Site with Thomas: Michael Brandon, David Mitton: Movies & TV". Amazon.com. Retrieved 2015-12-06.