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"We should've 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 was a mysterious boulder and it stood alone for a long time. But one day, a new quarry was being built near the mines on the land below and Rusty was afraid the giant boulder would fall onto the line. He confesses his fears to Thomas and Percy. Then 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 and Thumper is working harder than ever. He always works hard on the rocks below Boulder. Suddenly, Rusty notices something. He realises that Boulder is moving, but his driver does not believe him until Boulder falls down 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. Then, he sees Boulder heading for him catching up fast. He becomes surprised and quickly reverses, but soon slips into a siding, while the Boulder passes by. Boulder smashes up the water tower that was in between the tracks. Skarloey realises they have to warn the yards, but Rusty does not know how. Boulder rounds a bend and there ahead is Rheneas. He shouts that the boulder is running loose, as his driver quickly drives him back as fast as he can. Both Rheneas and the Boulder go along the viaduct, as Rheneas runs into some buffers with Boulder just missing him, but his driver sighs that it is rather a smash than a squash. At the yards, Percy is collecting trucks. Then, he hears Boulder approaching. Percy is shocked and realises that Boulder is heading straight for him. Percy makes his whistle squeak, closes his eyes, his crew jump off and Boulder crashes nearby into the sheds, causing a large explosion with 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, destroyed. He realises that they should have left this part of the island alone. 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 it's eyes are being carried on to the wind where it once used to stand proud and silent.




  • Going by production order, this is the twenty-sixth episode of the fifth season and the season finale.
  • Boulder's face is based upon Gordon's upset face.
  • The same model for Boulder is used for both the large-scale and normal-scale sets.
  • This episode marks the first and only appearance of Thumper 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 occurred 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 brought back to the quarry to help.
  • The scene where Boulder chases after Rusty, is most definitely based off of the Indiana Jones film Raiders of the Lost Ark. It's also similar to the Shining Time Station episode Mr. Conductor's Evil Twin where a monster nickel chases after Schemer. This reference was later used in the Thomas Around the World short, Thomas Goes for Gold.
  • Rusty's small-scale model is used at the beginning and end of the episode, but his large-scale model is used throughout the rest.
  • This is one of Davey Moore's favourite classic series episodes alongside Thomas' Train.


  • Due to his model being changed, Rusty's face gets bigger and then smaller again throughout the episode.
  • Boulder is still covered in moss while it chases Rusty. However, once it appears behind him, all the moss has vanished.
  • 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 to be overloaded of black marker. Also, he appears to be in Rusty's cab rather than Rheneas'.
  • When the water tower pieces crash onto Skarloey, his driver gets hit by the timber.
  • The term "trucks" was accidentally used in the US version.


In Other Languages

Language Name Meaning
Spanish Rusty y la Roca Rusty and the Rock
Japanese いわのボルダー Boulder the Rock
Welsh Y Graig The Rock
Dutch Rusty en het rotsblok Rusty and the Boulder
Hungarian Rusty és a vándorkő Rusty and the Boulder
Russian Расти и валун Rusty and the Boulder
Greek Σκουριασμένο και το ογκόλιθος Rusty and the Boulder
Danish Rusty og Rullestenen Rusty and the Rolling Stone
Polish Rudik i Głaz Rusty and the Boulder
Italian Rusty e il Masso Rusty and the Boulder
German Rusty und der Felsblock Rusty and the Boulder
Slovenian Zlatko in skala Rusty and Rock
Chinese 罗斯缇和石头 Rusty and Stones
Korean 러스티와 둥근 바위 Rusty and Round Rock
Romanian Rusty şi Bolovanul Rusty and Boulders
Slovak Rusty a Kameň Rusty and Stones
Norwegian Rusty og Rullesteinen Rusty and Rolling Stone
Cantonese 羅斯緹和石頭 Rusty and Stones
Swedish Rusty och stenbumlingen Rusty and the Boulder
Thai หัวรถจักรเกือบถูกก้อนหินใหญ่ทับ The Engine Was Almost Crushed Rocks

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