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This article is about the episode. You may be looking for the book, the Buzz Book or the magazine story.

“I'll have some of your floorboards, please!"
"I only swept the floor this morning.”
―Percy's Fireman and the Guard

Percy's Promise is the second episode of the third series. It is based on the story of the same name from the Railway Series book Percy the Small Engine.


Every Summer, the Island of Sodor is busy with holidaymakers visiting the Island to see the sights. With no sign of inclement weather, visitors often enjoy going to the mountains or the valleys while children enjoy the seaside. One day, Thomas is busy on a coastal run taking children to the beach. When he reaches the next station, he sees Percy taking some trucks to the harbour. Percy tells Thomas he wishes that he could take children rather than trucks, to which Thomas states that the children he is taking are the Vicar's Sunday School. He will also be busy in the evening, but then offers Percy to take the children back home, in which Percy agrees to do so.

At Dryaw, Harold warns Percy there is inclement weather and to run very carefully. He is also warned by Edward at the next station to be careful of an upcoming storm, but Percy knows what is going on. The children enjoy a fun day at the beach and arrive at the station, at which time the weather turns bad and begins raining hard. Percy arrives at the station he came to earlier, where Annie and Clarabel are glad when he arrives just in time to take the children home. Percy is disgusted by the rain, but (despite thinking of being at the sheds) he manages to get on with it.

As Percy begins his return journey, he battles onwards through coastal villages and the countryside. The heavy rain makes the river rise very quickly. The visibility is poor for Percy while he faces the elements, but there is trouble ahead; the tracks have been flooded and as Percy charges into the floodwaters, his fire is dampened as water floods into his cab. His crew then tries to find more firewood and his fireman asks the guard for some floorboards from the brake van. The guard grumbles that he had only swept the floor that morning, but still agrees to help. Percy's fire is soon burning well and he feels more comfortable again. He soon sees Harold, who he thinks has come to laugh at him. A crate attached to a parachute is dropped out and thuds on top of Percy's boiler, which is hot drinks that Harold has thoughtfully given to the crew hot drinks (for Percy thanks Harold before the helicopter flies away).

"You've kept your promise despite everything!"

Percy bravely continues on with his journey and begins losing steam again, but keeps going. He makes several efforts and triumphantly brings the children home. Thomas congratulates Percy for keeping his promise despite everything. The Fat Controller arrives aboard Harold and thanks Percy and his crew. The Fat Controller is greatly impressed with Percy's efforts and praises him for being a Really Useful Engine.




  • This episode was originally planned to be a part of the second series but was pushed to the third series.
  • In the original story, the floorboards were actually extracted from Clarabel. A non-sentient brake van was added and cut up in the adaptation to avoid the implication the fireman was using an axe to a sentient coach.
  • The episode can be seen in a Japanese game, Magical Adventure.
  • In the restored version:
    • A different scene of Arlesburgh with the sky being blue and no people being close to the house.
    • An extended shot of Percy meeting Edward at Elsbridge is shown, with the last few seconds cut off.
    • The fade effect and scene of Percy arriving at Elsbridge with Annie and Clarabel are removed and replaced with a cut and an extended shot of Thomas waiting for Percy.
    • The very last shot of Percy does not freeze.
  • This episode marks the first appearance of Tidmouth Hault.
  • In a rare picture, Edward is wearing his anxious face instead of his neutral expression face when he talks to Percy at Elsbridge.
  • Although being adapted for the third series, the events of this episode were mentioned in the second series episode, Percy Takes the Plunge. Thus, this episode most likely takes place before the aforementioned episode, but in the Railway Series, Percy's Promise takes place first, then Percy Takes the Plunge references this episode.
  • Deleted scenes from the first series of Thomas on Toby's Old Tramway are used at the beginning of the episode.
  • This episode reran back-to-back with the third series episode, Henry's Forest on Storytime with Thomas.
  • Modified models of the Coast Guard and a shrimper from TUGS appear at Suddery Coastal Village, making this the first episode to use TUGS models.
  • In the original UK dub and US dub, as well as the Ukrainian dub when Harold and Edward warn Percy about the storm and when Percy returns to Tidmouth Hault to take the children home, the music is omitted.
  • This episode was never released on home media or aired on television on Finland, it was only released on a website in 2015.
  • The Vicar of Wellsworth takes the role of the Vicar of Knapford.
  • This is the first episode to feature Annie's raised front bufferbeam.
  • The first scene of the episode was used in the sixth series' intro.


  • When Percy plunges into the flooded tracks, Annie and Clarabel have swapped positions and the water appears to come above his firebox. However, in the next shot, the water is below his buffers. Also when Percy plunges into the flooded truck, the ground sinks severely, and a bush moves on its own.
  • When Thomas is on Toby's Old Tramway, Clarabel is facing the wrong way. Then in the next shot, Annie is facing the wrong way.
  • Despite the fact that the water only reached Percy's footplate, he has a water line across his boiler when he meets Thomas at the end of the episode.
  • In the shot of Percy's driver and fireman during the scene where Percy is in the flooded water, the fence behind them is submerged; but in the close-up of the fireman, the fence is completely above the water. This changes again in the shot of the driver, fireman and guard carrying the wooden planks through the water.
  • When Thomas talks to Percy at Tidmouth Hault, a red mark can be seen next to his left eye.
  • When Percy puffs out of Tidmouth Hault the points are set where he goes into the yard with the passengers.
  • When Percy says, "I wish I could see," his roof is lifted.
  • In the Polish dub, Edward's English name was used by accident.
  • When Percy rounds the last bend the puddle near the tracks contains black plastic.
  • The narration on the Trust Thomas and Other Stories DVD is severely out of sync.
  • When Percy says, "Oh the water is sloshing my fire!" his boiler has a large chip on it.


Harold: Sorry, Percy. Can't talk. I'm on high alert.
Percy: Why?
Harold: Bad weather's due. My help's always needed. Mind how you go, Percy.
Percy: Ha! As long as I've got rails to run on, I can go anywhere, in any weather, anyhow. [leaves] Goodbye!

Edward: Be careful. There's a storm coming.
Percy: A promise is a promise, no matter what the weather.

The Fat Controller: Harold told me you were a wizard. He says he can beat you at some things, but not at being a submarine. I don't know what you two get up to sometimes, but I do know that you're a really useful engine.


In Other Languages

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Language Title
Brazilian Portuguese A Promessa de Percy
Chinese Mandarin 培西的承诺
Czech Perchyo Slib
Danish Percys Løfte
Dutch Percy's Belofte
Finnish Pekan Lupaus
German Percys Versprechen
Greek Η Υπόσχεση του Τζέρι
Hungarian Percy Ígérete
Italian Salvataggio
Japanese パーシーとこうずい
Korean 약속을 지킨 퍼시
Latin American Spanish La Promesa de Percy
Norwegian Percys Løfte
Polish Obietnica Piotrka
Romanian Promisiunea lui Percy
Russian Обещание Перси
Serbian Persijevo Obećanje
Slovenian Poldijeva Obljuba
Swedish Percys Löfte
Turkish Percy'nin Sözü
Ukrainian Обіцянка Персі
Welsh Addewid Pyrsi

Home Media Releases


DVD Boxsets




  • Trust Thomas and Other Stories
  • Thomas and His Friends Help Out
  • 10 Years of Thomas
  • Best of Percy

VHS/DVD Boxsets


DVD Boxsets





DVD Boxsets














  • Thomas and Friends Season 1-4



Video Games