Until 2008, all characters were silent, with the exception of the show's narrator. Voices were given to the characters following the switch to full CGI animation in 2009.
| Actor |
Region |
Role(s) |
| Mark Moraghan |
UK/US |
The Narrator (Series 17 onwards) |
| John Hasler |
UK |
Thomas (The Adventure Begins onwards) |
| UK/US |
Rheneas (The Great Race onwards)[1] |
| Joseph May |
US |
Thomas (The Adventure Begins onwards) |
| David Bedella |
US |
Victor and The Mayor of Sodor |
| UK/US |
Victor (Blue Mountain Mystery onwards), The Cuban Man and The Mayor of Sodor (Series 19 onwards) |
| Jamie Campbell Bower |
UK/US |
Skiff |
| Jonathan Broadbent |
UK/US |
Bill, Ben and The First Slip Coach |
| Nathan Clarke |
UK/US |
Alfie |
| Olivia Colman |
UK/US |
Marion |
| Tina Desai |
UK/US |
Ashima |
| Jonathan Forbes |
UK/US |
Connor |
| Teresa Gallagher |
UK |
Emily, Rosie, Mavis, Lady Hatt, Stephen Hatt (Diesel's Special Delivery), Bridget Hatt, The Duchess of Boxford, Bridget Hatt's Friends, The Teacher, The Laundry Lady, Some Children, The School Children, The Girl in the Red Dress, The Blonde-hair Girl, The Blonde-hair Boy and Albert's wife |
| UK/US |
Belle, Frieda, Gina, Daisy, Mavis (Series 17 onwards), Annie, Clarabel, Judy, The Ginger-hair Boy, The Shouting Little Boy, The Duchess of Boxford (Series 17 only), Lady Hatt (Series 17 only), The Lady with the Big Hat, Some Passengers, The Teacher (Series 18 only), The Knapford Station Speaker (The Adventure Begins), Some Children (The Adventure Begins onwards), Stephen Hatt (Series 19 onwards), Bridget Hatt (Series 19 onwards), The School Children (Lost Property), and The Barrow Fan. |
| US |
The Blond-haired Girl and The Blonde-haired Boy (Very Important Sheep) |
| Bob Golding |
UK/US |
Stephen, Sidney, Some Dock Workers (Tale of the Brave) and A Railway Inspector (Lost Property) |
| Mike Grady |
UK/US |
Sir Robert Norramby |
| Rasmus Hardiker |
UK/US |
Philip |
| William Hope |
US |
Edward, Toby, Whiff, Bash, Rocky, Stephen Hatt (Thomas and the Runaway Kite only), Farmer McColl, The Duke of Boxford, The Blond-haired Boy (Merry Misty Island only), The Maithwaite Stationmaster (Double Trouble and Wonky Whistle only), The Dock Manager and The Wellsworth Station Worker |
| UK/US |
Bert (the Diesel) (Series 16 onwards), A Railway Inspector, A Steamworks Worker (Wonky Whistle), Two Farmhands (Wonky Whistle) and A Workman (Toad and the Whale) |
| Sir John Hurt |
UK/US |
Sailor John |
| Togo Igawa |
UK/US |
Hiro |
| Rufus Jones |
UK/US |
Flying Scotsman |
| Jules de Jongh |
US |
Emily, Rosie, Mavis (Hero of the Rails – Blue Mountain Mystery), Lady Hatt, Bridget Hatt (Series 13–14), The Duchess of Boxford, Bridget Hatt's Friends, Stephen Hatt (Diesel's Special Delivery), The Teacher, The Laundry Lady, Some Children, The Girl in the Red Dress, The Blond-haired Boy (Series 15 – 18), The Blond-hair Girl, and The School Children |
| UK/US |
Alicia Botti |
| Ashna Kapur |
UK |
The Blond-haired Girl (Very Important Sheep) |
| Steven Kynman |
UK/US |
Duck, Peter Sam, Dart (Series 17 onwards), Paxton, The Third Slip Coach, A Railway Inspector (Series 17) and The Bird Watcher (Who's Geoffrey?) |
| UK |
Porter, Jack and The Dock Manager (Tale of the Brave only) |
| US |
Butch (Series 17 onwards) |
| Michael Legge |
UK/US |
Luke |
| Clive Mantle |
UK/US |
Gator |
| Oliver McCue |
UK |
The Blond-haired Boy (Very Important Sheep) |
| David Menkin |
US |
Stanley (Season 18 only), Porter and Jack |
| Joe Mills |
UK/US |
Donald, Douglas, Oliver, Toad, The Welsh Bird Watcher and A Knapford Station Yard Workman (Toad and the Whale) |
| Maggie Ollerenshaw |
UK/US |
Henrietta |
| Rebecca O'Mara |
UK/US |
Caitlin and The Second Slip Coach |
| Nigel Pilkington |
UK |
Percy (Series 19 onwards) and Trevor |
| Rob Rackstraw |
UK/US |
Axel, Flynn (Series 19 onwards), Race Announcer and Some Passengers |
| UK |
Toby (Series 19 onwards) and Stanley (Series 19 only) |
| US |
James (The Adventure Begins onwards) and Stanley (Series 19 onwards) |
| Christopher Ragland[2] |
US |
Percy (Series 19 onwards) and Trevor |
| UK/US |
The Troublesome Trucks (The Adventure Begins onwards) |
| Miranda Raison |
UK/US |
Millie and The Knapford Station Speaker |
| Eddie Redmayne |
UK/US |
Ryan |
| John Schwab |
UK/US |
Vinnie |
| Kerry Shale |
US |
Henry, Gordon, James (Hero of the Rails – Series 18), Dash, Scruff, Harold, Kevin, Sir Topham Hatt (Hero of the Rails – Series 18), Mr. Percival, Sir Lowham Hatt, Farmer Trotter, The Maithwaite Stationmaster (Time For a Story and A Blooming Mess only), A Railway Inspector, The Photographer (Series 16), The Railway Coal Inspector, The Zoo Keeper and Some Workmem |
| UK |
Diesel, and The Zoo Keeper (Not Now, Charlie! only) |
| UK/US |
Diesel (Series 19 onwards), 'Arry, Bert (the Diesel) (Series 14 – 15), Some groaning passengers (Calm Down Caitlin) and The Man on the Bridge |
| AUS/NZ |
Mr. Percival (Duncan and the Grumpy Passenger only) |
| Tom Stourton |
UK/US |
Duncan and Rex |
| Tim Whitnall |
UK/US |
Timothy, Mike, Jerome, Oliver the Excavator, Reg, The Deputy Minister and Some Workmen |
| US |
The Man with the Hat (Spencer's VIP) |
| Keith Wickham |
UK |
Edward, Henry, Gordon, James, Percy (Hero of the Rails – Sodor's Legend of the Lost Treasure), Whiff, Dash, Harold, Sir Topham Hatt, The Mayor of Sodor (Series 13 – 16), The Thin Controller, Sir Lowham Hatt, Mr. Bubbles, The Railway Coal Inspector, The Man at the Fire, The Wellsworth Station Worker, The Fat Controller's Assistant, Some Workmen, Some Passengers, Gator's Driver, Steamworks Workman and Albert |
| UK/US |
Harvey, Glynn, Salty, Den, Norman, Stafford, Skarloey, Sir Handel, Bert (Steam Engine), Bertie (Series 17 onwards), Captain, Sir Topham Hatt (The Adventure Begins onwards), Dowager Hatt, Lord Callan, The Photographer (Wild Water Rescue), A Railway Inspector, The Great Composer, The Maron Station Speaker, The Wellsworth Stationmaster, Thomas' Guard, The Grumpy Passenger, Father Christmas, The Groudsman, The Postman, Gordon's Driver (The Adventure Begins), James's Guard (The Adventure Begins), A Knapford Station Worker (The Adventure Begins), Some Workmen, Some Signalmen, The Dock Manager (Who's Geoffrey? only), A Sodor Search & Rescue Centre Worker (Toad and the Whale), A Policeman (Sodor's Legend of the Lost Treasure) and A Diver (Sodor's Legend of the Lost Treasure) |
| Robert Wilfort |
UK/US |
Samson and a Judge (The Great Race) |
| Matt Wilkinson |
UK |
Spencer, Stanley, Charlie, Bash, Scruff, Victor (Hero of the Rails – Series 16), Rocky, Cranky, Butch (Series 16 onwards), Kevin, Stephen Hatt (Thomas and the Runaway Kite only), Farmer McColl, The Duke of Boxford, The Photographer (Series 16), The Maithwaite Stationmaster, Farmer Trotter, The Knapford Stationmaster, The Bird Watcher (Henry's Good Deeds), The Blond-haired Boy (Merry Misty Island only), The Dock Manager, A Railway Inspector, Some Dock Workers, The Island Inspector, The Sodor Search & Rescue Centre Manager, The Blue Mountain Quarry Workman, The Zoo Keeper and The Man with the Hat |
| UK/US |
Diesel 10, Winston, Rusty, Merrick and Some Workmen |
| Glenn Wrage |
US |
Spencer, Charlie (Series 13 – 15), Ferdinand, Cranky, Butch (Series 15 – 16), The Sodor Search & Rescue Centre Manager, Sir Topham Hatt's Assistant, Gator's Driver and A Steamworks Worker |
| UK/US |
Flynn (Toad and the Whale only) |
