A promotional image of Den

Den is a diesel engine who works at the Dieselworks with Dart.

Date of Birth

  • June 16, 2000


Den is a diesel who runs the Dieselworks when Diesel 10 is not around.

Den is slow and thoughtful. While he is not devious, he is still a diesel.


Den is based on the Rolls Royce Sentinal Diesel Hydraulic 0-4-0.


Season 15

  • Stop That Bus (cameo)
  • Stuck on You (cameo)
  • Tree Trouble
  • Fiery Flynn

Season 16

  • Ol' Wheezy Wobbles
  • Thomas Toots the Crows
  • Bust My Buffers

Season 17

  • Steamie Stafford (cameo)
  • Away from the Sea

Season 18

  • Dissapering Diesels
  • Gator-Saur Rex

Voice Actors


  • Wooden Railway
  • Trackmaster
  • Take N Play
  • Mega Bloks
  • Hornby (coming soon)


  • Den's theme is the Roll Call from the Day of the Diesels theme song, which he shares with Dart, Norman, Paxton, and Sidney.


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