Caution: Runaway Engine! will be the eighteenth episode of the seventeenth season of Thomas and Friends.



  • Thomas
  • Flynn
  • Skarloey
  • Sir Handel
  • Peter Sam
  • Rusty
  • Owen
  • The Thin Controller
  • Miss Marvel
  • Rheneas (cameo)
  • Rocky (cameo)
  • Merrick (cameo)

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