The tenth season was first broadcast in 2006. It is the last season to be filmed in standard definition.
Episodes
- Follow That Flour - Thomas looks for a truck of flour.
- A Smooth Ride - Sir Handel returns from the quarry, but is afraid he'll be sent back when he starts bumping.
- Thomas and the Jet Plane - Thomas meets a snooty jet plane named Jeremy.
- Percy and the Funfair (Percy and the Carnival) - Percy wants to be part of a funfair.
- The Green Controller - Lady Hatt appoints Percy to give the engines orders as the Fat Controller has lost his voice, but Percy causes confusion.
- Duncan Drops a Clanger - Duncan transports a church bell, but due to his carelessness he loses it for a bit.
- Thomas' Tricky Tree - Thomas has been sent to collect a Christmas tree, but can't find it.
- Toby's Afternoon Off - Toby wans to visit the farm after finishing his jobs, but is given three more jobs.
- It's Good to be Gordon - Gordon steals Henry's coal to make him go faster, leaving Henry to break down.
- Seeing the Sights - Thomas races from place to place and leaves passengers behind at each stop.
- Fearless Freddie - An old engine named Freddie realises he's ageing after resorting to cheating in a race with Skarloey and Rheneas.
- Toby's New Shed - Toby is upset when the birds roosting in his shed are made homeless when his shed is renovated. Thomas puts things right.
- Edward Strikes Out - Edward teases a new crane called Rocky, but eats his words after Rocky helps Gordon after an accident.
- Topped Off Thomas - While racing Spencer, Thomas blows the Fat Controller's top-hat away and is told to find it again.
- Which Way Now? - Rusty rushes workmen so he can take the Fat Controller around the Skarloey Railway.
- Thomas and the Shooting Star - Thomas gets lost searching for a shooting star.
- Big Strong Henry - Henry tries to prove he is the strongest engine on the railway, but ends up crashing.
- Wharf and Peace - Skarloey is startled at the wharf and is too scared to return.
- Thomas' Frosty Friend - A snowman-shaped balloon attaches itself to Thomas' bunker.
- Emily and the Special Coaches - Gordon is getting new coaches for setting a speed record, but Diesel thinks he is special too and out of spite steals them.
- Thomas and the Colours - Thomas tries to convince James to give him the job of pulling the Sodor football team.
- Thomas and the Birthday Mail - Thomas is annoyed when a new tank engine, Rosie, harasses and follows him.
- Duncan's Bluff - Duncan cheats in a race with James.
- Missing Trucks - Rheneas' good deed of helping Skarloey causes trouble.
- Thomas and the Treasure - Thomas goes looking for treasure, following clues told by Salty.
- James the Second Best - James is upset when Edward is chosen to appear on a railway poster.
- Thomas and Skarloey's Big Day Out - Thomas takes Skarloey to the works, but delays to show him the sights, and disaster strikes.
Characters
- Thomas
- Edward
- Henry
- Gordon
- James
- Percy
- Toby
- Duck (music video cameo)
- Emily
- Bill and Ben
- Harvey
- Molly
- Diesel
- Skarloey
- Rheneas
- Sir Handel
- Peter Sam
- Rusty
- Duncan
- Mighty Mac
- Spencer
- Annie and Clarabel
- Mavis
- Troublesome Trucks
- Terence
- Bertie
- Harold
- Cranky
- Sir Topham Hatt
- Mr. Percival
- The Duke and Duchess of Boxford
New Characters
- Rosie
- Freddie
- Jeremy
- Rocky
- Chris
- Dusty Dave
- Mrs. Percival (does not speak)