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- Season 21 overviewSep 18, 2017-May 4, 201920 episodesSeason 21 episodes1. Springtime for Diesel Sep 18, 2017
- Diesel, the diesel shunter, isn't a very easy engine to be friends with; Diesel is always bumping.
- 2. A Most Singular Engine Sep 19, 2017
- Diesel is sick and tired of hearing Daisy the diesel railcar describe herself as a single engine.
- 3. Dowager Hatt's Busy Day Sep 20, 2017
- When Sir Topham Hatt catches a cold, his mother offers to run the railway while he is sick.
- 4. Stuck in Gear Sep 21, 2017
- Harvey is a rather understated engine who doesn't like to draw too much attention to himself.
- 5. Runaway Engine Sep 22, 2017
- Millie has extra work to do, including collecting gravel from the quarry.
- 6. P.A. Problems Sep 25, 2017
- Sir Topham Hatt splashes out on a new public address system at Knapford; Edward is dispatched.
- 7. Hasty Hannah Sep 26, 2017
- Toby is worried when Henrietta has to go to the Steamworks to have her seats refurbished.
- 8. Cranky at the End of the Line Sep 27, 2017
- Cranky is starting to creak, and Salty teases him about his age.
- 9. New Crane on the Dock Sep 28, 2017
- Carly is the new crane at Brendam Docks and she is awake early and keen to start working.
- 10. Unscheduled Stops Sep 29, 2017
- Bertie has to go to the garage and Thomas takes his passengers for him; Thomas stops.
- 11. Philip's Number Oct 2, 2017
- Gordon teases Philip about the number 68 that he has painted on his side.
- 12. The Fastest Red Engine on Sodor Oct 3, 2017
- James boasts that he's the fastest red engine on Sodor; Thomas says Rosie might be faster.
- 13. A Shed for Edward Oct 4, 2017
- Edward is sent to stay at Philip's shed; Philip is so excited that he chatters away all night.
- 14. The Big Freeze Dec 1, 2017
- It's winter on Sodor; The steam engines are still waiting for the coal delivery to arrive.
- 15. Emily in the Middle Dec 6, 2017
- One snow day, Donald and Douglas pick up a long train of heavy flatbeds.
- 16. Terence Breaks the Ice Dec 11, 2017
- Terence is busy working with The Woodsmen, who are cutting down fir trees for the Christmas Market.
- 17. Daisy's Perfect Christmas Dec 18, 2017
- Daisy loves a traditional Sodor Christmas so she is upset when things go differently.
- 18. Confused Coaches Dec 22, 2017
- Spencer and Gordon are very competitive; Spencer boasts about being a private engine.
- 19. Outback Thomas Oct 22, 2018
- Thomas and friends learn important lessons about life and friendship.
- 20. Tiger Trouble/Rosie is Red May 4, 2019
- Thomas, Shankar, and Rajiv team up to catch some tiger poachers in India. Back on Sodor, the other engines tease Thomas that Rosie is his "special friend and he acts meanly towards her.