Actor / Actress Region Role (s) Joseph May US Thomas ("The Adventure Begins '' onwards) John Hasler UK UK / US Rheneas (series 20 onwards) David Bedella Victor, Carlos, The Mayor of Sodor and the Cuban man Jamie Campbell Bower Skiff Jonathan Broadbent Bill, Ben and The First Slip Coach Nathan Clarke Alfie Olivia Colman Marion Jules de Jongh US Emily, Lady Hatt (Season 13, "Day of the Diesels '', and Season 15), the Duchess of Boxford, Stephen Hatt ("Diesel 's Special Delivery ''), Bridget Hatt, Bridget Hatt 's friends, Mavis (Season 13 -- 16), the teacher, the laundry lady, some children, small little boy, the ginger - haired boy ("Diesel 's Special Delivery '', "Emily and Dash '', "Percy the Snowman '', "Emily 's Winter Party Special '' and "Pouty James ''), little girl in the red dress, the blond - haired boy (Season 15 -- 18), the blond - haired girl, and the school children UK / US Emily ("4 - D Bubbling Boilers '' only) and Alicia Botti Jonathan Forbes Connor Teresa Gallagher UK Emily, Lady Hatt (Season 13, "Day of the Diesels '' and Season 15), The Duchess of Boxford, Stephen Hatt ("Diesel 's Special Delivery ''), Bridget Hatt, Bridget Hatt 's friends, the teacher, the laundry lady, small little boy, some children, the school children, little girl in the red dress, the blonde - hair girl, the blonde - hair boy and Albert 's wife US The blond - haired girl and the blonde - haired boy ("Very Important Sheep '') UK / US Belle, Frieda, Gina, Mavis, Annie, Clarabel, Judy, Lady Hatt (Season 17 only and Season 21 onwards), the teacher (Season 18 only), the ginger - hair boy, the shouting little boy, the lady with the big hat, some passengers, the Knapford Station speaker ("The Adventure Begins ''), some children ("The Adventure Begins '' onwards), the school children ("Lost Property ''), Stephen Hatt, Bridget Hatt, the lady in the blue dress, the barrow fan ("Reds vs. Blues '' and "Useful Railway ''), Albert 's wife ("Thomas the Babysitter '' and "Unscheduled Stops ''), the lady in the spring green dress, the female puppet show entertainer, little girl in the turquoise dress with pink flowers, the lady in the white dress and gray vest, the lady in the white shirt, light brown skirt and hat, the lady in the grayish white shirt, blackish gray skirt, and white pearl necklace, the chubby little boy in dark green shirt and dark gray shorts and the lady in the yellow dress and hat Bob Golding Stephen, Sidney (series 17 onwards), Ivan, some dock workers ("Tale of the Brave '') and a railway inspector ("Lost Property '') Mike Grady Sir Robert Norramby Rasmus Hardiker Philip and Some Troublesome Trucks ("The Fastest Red Engine on Sodor '' only) UK Monty William Hope US Edward, Toby, Stephen Hatt ("Thomas and the Runaway Kite '' only), Whiff, Bash, Rocky, Farmer McColl, the Duke of Boxford, the blond - haired boy ("Merry Misty Island '' and "The Way She Does It '' only), the Maithwaite stationmaster ("Double Trouble '' and "Wonky Whistle '' only), the man in the gray shirt and black pants ("Race to the Rescue ''), the Dock Manager and the Wellsworth Station worker UK / US Bert (the Diesel) (series 16 onwards), a railway inspector, a steamworks worker ("Wonky Whistle ''), 2 farmhands ("Wonky Whistle ''), a workman ("Toad and the Whale ''), Passenger, and Farmer McColl ("Philip 's Number '' only) Togo Igawa Hiro Rufus Jones Flying Scotsman Ashna Kapur UK The blond - haired girl ("Very Important Sheep '') Steven Kynman Porter, Jack and the dock manager ("Tale of the Brave '' only) US Charlie ("The Great Race '' onwards) and Butch (series 17 onwards) UK / US Duck, Ryan (series 20 onwards), Dart (Season 17 onwards), Paxton ("Blue Mountain Mystery '' onwards), Peter Sam, "The Third Slip Coach '', a workman (Journey Beyond Sodor), a railway inspector (Season 17) and the bird watcher ("Who 's Geoffrey? '') Michael Legge Luke Oliver McCue UK The blond - haired boy ("Very Important Sheep '') Ian McCue UK / US The Blue Sea Serpent David Menkin Porter (US; series 17 onwards / UK; "Pouty James '' and "Cranky at the End of the Line '' only) and Stanley ("The Truth About Toby '' only) US Jack Joe Mills UK / US Douglas, Oliver, Toad, the Welsh bird watcher ("Thomas and the Emergency Cable ''), and a Knapford Station yard workman ("Toad and the Whale '') Lucy Montgomery Lexi, Hannah and Carly Tracy - Ann Oberman Daisy (series 20 onwards) Maggie Ollerenshaw Henrietta Rebecca O'Mara Caitlin and the Second Slip Coach Nigel Pilkington UK Percy (Series 19 onwards), and Trevor UK / US A passenger Rob Rackstraw James (US; Season 19 onwards / UK; "Tit for Tat '' onwards), Donald (Season 20 onwards), Raul, Axel, Étienne, Flynn (Season 19 onwards), Bradford, The Great Railway Show announcer, some passengers, the man in the blue shirt and light brown hat, The Bird Watcher ("The Railcar and the Coaches ''), Fergus Duncan, The Welsh Bird Watcher ("Mike 's Whistle ''), The Thin Clergyman ("Tit for Tat ''), and The Red Sea Serpent. UK Toby (Season 19 onwards) US Monty Christopher Ragland Percy (Season 19 onwards) and Trevor UK / US The Troublesome Trucks ("The Adventure Begins '' onwards) Miranda Raison Millie and the Knapford Station speaker Kerry Shale UK Thomas and Spencer ("Hero of the Rails '', originally) US Henry, Gordon, James ("Hero of the Rails '' -- Season 18), Dash, Scruff, Harold, Max, Kevin, Sir Topham Hatt ("Hero of the Rails '' -- Season 18), Sir Lowham Hatt, Mr. Percival, Farmer Trotter, The Maithwaite stationmaster ("Time For a Story '' and "A Blooming Mess ''), a railway inspector, the photographer (Season 16), the railway coal inspector, the zoo keeper and some workmen UK / US Kevin ("Hasty Hannah '' only), Diesel (series 19 onwards), ' Arry, some groaning passengers ("Calm Down Caitlin '') and the man on the bridge John Schwab Vinnie, Bridlington Diesel, Ulli US Stanley (Series 20 onwards, excluding "Saving Time '') Nicola Stapleton UK / US Rosie (Season 21 onwards) Tom Stourton Duncan, Rex, Terence and The Fat Clergyman Tim Whitnall Timothy, Mike, Jerome, Oliver the Excavator, Reg, the deputy minister and some workmen US The man in the hat ("Spencer 's VIP '') UK Max Keith Wickham Edward, Henry, Gordon, James ("Hero of the Rails '' -- Season 20, excluding "Tit for Tat ''), Whiff, Dash, Harold, the Thin Controller, the railway coal inspector, the man at the fire, the Wellsworth station worker, The Man in the Gray Shirt and Black Pants, the Fat Controller 's assistant, some workmen, some passengers, Gator 's driver, and steamworks workman UK / US Harvey, Glynn, Salty, Den, Norman, Stafford, Skarloey, Sir Handel, Bert (the small engine), Bertie, Captain, Sir Topham Hatt (UK; "Hero of the Rails '' onwards, US; "The Adventure Begins '' onwards), Dowager Hatt, Sir Lowham 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 groundsman, the postman, Gordon 's driver ("The Adventure Begins ''), James ' guard ("The Adventure Begins ''), a Knapford station worker ("The Adventure Begins ''), some workmen, sometsignalmen, 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 ''), a diver ("Sodor 's Legend of the Lost Treasure ''), The Man in the Hat, some passengers, Albert ("Thomas the Babysitter ''), Mr. Bubbles, the man in the sea green shirt and glasses, the Welsh bird watcher ("Sidney Sings and Three Steam Engines Gruff ''), one of Dowager Hatt 's friends ("Best Engine Ever '' and "Sidney Sings ''), the museum manager, male puppet show entertainer, the man in the gray shirt and black pants, the Great Railway Show judge, the fat clergyman, the man in the blackish gray shirt and blackish gray pants, Willie the lazy farmer, the man in the black shirt and black pants, Franz, The Man in the Whitish Brown Shirt and Brown Pants, and The Station Announcer. Robert Wilfort Samson and the Great Railway Show judge ("The Great Race '') Matt Wilkinson UK Spencer, Stanley, Charlie, Bash, Scruff, Rocky, Cranky, Butch (Season 16 onwards), Kevin, Stephen Hatt ("Thomas and the Runaway Kite ''), 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 ''), 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, Captain Joe and some workmen Glenn Wrage US Spencer, Ferdinand, Cranky, the Sodor search & rescue centre manager, Sir Topham Hatt 's Assistant, Gator 's driver and a Steamworks worker
who does the voiceover for thomas the tank engine
Joseph May John Hasler