“We should have left this part of the Island alone...”
―Sir Topham Hatt

Rusty and the Boulder is the twenty-fifth episode of the fifth season.


On the Island of Sodor, high up in the mountains, there is a mysterious boulder that has stood alone for a long time. But one day, a new quarry is built near the mines on the land below and Rusty is afraid the giant boulder would fall onto the line. He confesses his fears to Thomas and Percy. Edward arrives with a new machine called Thumper to help with the mining process. Soon, Thumper is working hard. The men are pleased, but no one bothers to check the boulder. But when it started raining, the workmen left. Rusty gazed up and shivered as above stood Boulder. Suddenly, a large slab of rock lands on the rails. Rusty is shocked and worried by this, but his driver is concerned. His driver thinks the rock has been loosened by the rain, but Rusty thinks it is Boulder telling them to go away. As they leave, a face mysteriously appears on Boulder and then disappears.

The next day, the sun is shining again and Thumper begins working harder than ever. Suddenly, Rusty notices something; Boulder begins moving, but his driver does not believe him until Boulder falls down and lands on the rails in front of them and begins to chase Rusty. Boulder rolls along the line of the rails as Rusty quickly drives himself backwards to get away from Boulder. Rusty and his driver stop at a junction and wait for Boulder to pass by, but Boulder is nowhere to be seen. Then, they soon realise that Boulder is behind them. Just ahead, they see a small junction, so Rusty races towards it. Rusty takes the line that goes uphill, while Boulder thunders past by them.

Meanwhile, Skarloey is making his way up to the quarry, but he sees Boulder heading for him and catching up fast. He becomes surprised and immediately reverses, but soon slips into a siding, while the Boulder passes by. Boulder destroys the water tower that was in between the tracks. Skarloey tells Rusty that they have to warn the yards, but he does not know how. Boulder rounds a bend and charges towards Rheneas and he races back as fast as he can to get away from Boulder until he crashes into a siding with Boulder just passing by him, much to the relief of his driver. At the yards, Percy is collecting trucks when he heard and saw Boulder approaching. Boulder destroys the neighbouring sheds, engulfing it in flames.

When the Fat Controller inspects the damage, he has no choice but to close the mine. Then he looks at Boulder with the shed, demolished. He realises that they should have left this part of the island alone. At night, they move Boulder to a hill close by the yards so it would never harm anyone or anything on the island anymore. Rusty is sure that, on a clear night, it is gazing high up at the mountains in the distance and that its sighs are being carried on to the wind where it once used to stand, proud and silent.


  • Thomas
  • Edward
  • Percy
  • Skarloey
  • Rheneas
  • Rusty
  • Sir Topham Hatt
  • Thumper (does not speak)
  • Boulder (does not speak)
  • Terence (cameo)
  • George (cameo)
  • Butch (cameo)


  • Boulder Quarry
  • Rheneas Viaduct
  • Echo Pass Ravine


  • Going by production order, this is the twenty-sixth episode of the fifth season and the season finale.
  • Boulder's face is based upon one of Gordon's face masks.
  • The same model for Boulder is used for both the large-scale and normal-scale sets.
  • This episode marks the first and only appearances of Thumper and Boulder to date.
  • In this episode, the quarry was brand new and closed in a short amount of time, meaning the events of Bye George! and Duncan Gets Spooked must have taken place during the events of this episode, as they also took place at the Boulder Quarry yards at the base of the mountain. Furthermore, George is seen at Thumper's dig site before Boulder gets loose, meaning that he served his week-long punishment and was brought back to the quarry to help.
  • The scene where Boulder chases after Rusty is a reference to the Indiana Jones film, Raiders of the Lost Ark. This reference was later used again in the Thomas' YouTube World Tour short, Thomas Goes for Gold.
  • Oliver was in the Wooden Railway only, but he does not appear in this episode.
  • Rusty's small-scale model is used at the beginning and end of the episode, while his large-scale model is used for the remainder of this episode.
  • This is one of Davey Moore's favourite episodes alongside Thomas' Train.
  • In the UK version, the line "EYYOIIIKES!!!" was re-used from Busy Going Backwards for Skarloey and Rheneas, when Boulder charges after them. 
  • The outer frame of the steel rig from the TUGS episode High Tide is visible at the shed area.


  • Due to his model being changed, Rusty's face gets bigger and then smaller again throughout the episode.
  • In the close-ups of Rheneas, the hook attached to the camera he is pulling along is visible.
  • In the close-up of Rheneas' driver, his right eye (viewer's left) appears overloaded of black marker. Also, he appears to be in Rusty's cab instead than Rheneas'.
  • In the second close-up of Percy when Boulder was approaching, it appears that the shed has already been destroyed as the wood from the shed is laying on Percy's trucks.


  • Percy: Where's all this rock coming from?
  • Rusty: The new quarry. This mountain rock is good for many things, although it's dangerous up there.
  • Thomas: Why?
  • Rusty: Because of a big boulder. I think it's watching me.
  • Percy: How can it be? Boulders don't have eyes!
  • Rusty: That says maybe, Percy, but there's something strange about this one. (US: "Well, Percy, there's something strange about this one.")

[Edward arrives with a machine named Thumper for the quarry]

  • Rusty: What's that?
  • Edward: It's called Thumper. Apparently, it helps collect the rock faster.


  • Rusty[to his driver] I think it's the boulder wanting us to go away.


  • Skarloey: We must warn the yards!
  • Rusty: Yes, but how?


  • Rheneas's Driver(relieved) Rather a smash than a squash! (US:"Better a smash than a squash!")


  • Wooden Railway - Boulder Mountain Set
  • Tomica (discontinued)
  • Take Along (discontinued)
  • TrackMaster (discontinued)
  • Wind-up Trains (Japan only) - Boulder

In Other Languages

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Language Title
Chinese 罗斯缇和石头
Danish Rusty og Rullestenen
Dutch Rusty en het Rotsblok
German Rusty und der Felsblock
Greek Σκουριασμένο και το ογκόλιθος
Hungarian Rusty és a Vándorkő
Italian Rusty e il Masso
Japanese いわのボルダー
Korean 러스티와 둥근 바위
Norwegian Rusty og Rullesteinen
Polish Rudik i Głaz
Romanian Rusty şi Bolovanul
Russian Расти и валун
Serbian Rasti i Veliki Kamen
Slovak Rusty a Kameň
Slovenian Zlatko in Skala
Spanish Rusty y la Roca
Swedish Rusty och Stenbumlingen
Thai หัวรถจักรเกือบถูกก้อนหินใหญ่ทับ
Welsh Y Graig
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