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Den runs the Sodor Dieselworks with Dart.
Bio
Den is a diesel who runs the Dieselworks… when Diesel 10 is not around. While he isn't devious, he is still a diesel. Den is a hard worker and popular among the diesels. He is very thoughtful and thinks hard before he speaks. When Den does speak it is very slowly. This gives the appearance that he may be a little slow, but nothing could be further from the truth. Engines can wait a long time for Den to give his insight, but it is worth the wait![1]
In Day of the Diesels, Den and Dart take Percy to the back shed of the Dieselworks while Thomas, Diesel 10, and the other Diesels take over the Steamworks.
In the fifteenth series, he was classified as a weather reporter engine along with Dart. Den later was so mad over Diesel 10 being so evil that he turned evil himself and wanted all diesels scrapped for good. Can Den be turned good again? Well we'll soon find out in a new Thomas movie.
Persona
Den has a tendency to speak very slowly, and will often be heard saying, “What I mean to say is...” before Dart interrupts and does his talking for him. However, Den is a deep thinker and a very knowledgeable Diesel, who is a true asset to the Fat Controller’s Dieselworks.
Basis

Den is based on a Rolls Royce Sentinel Diesel-Hydraulic 0-4-0.
Voice Actor
- Keith Wickham (UK/US; Day of the Diesels onwards)
Trivia
- Den is featured on the Dieselworks' logo.
Locomotives | Steam | Thomas | Edward | Henry | Gordon | James | Percy | Toby | Duck | Donald and Douglas | Oliver | Emily | Alice | Eric | Lily | Harvey | Fergus | Arthur | Murdoch | Molly | Neville | Rosie | Whiff | Stanley | Peter | Victor | Charlie | Scruff | Belle | Porter | Ryan | Nia | Rebecca | Sonny |
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Diesel | Daisy | BoCo | Bear | The Works Diesel | Pip | Emma | Diesel | Derek | 'Arry and Bert | Diesel 10 | Salty | Dennis | Den | Dart | Paxton | Norman | Sidney | Philip | |
Other | The Ballast Spreader | Peel Godred Engines | Flynn | Winston | Stafford | Dustin | |
Former | 98462 | 87546 | Glynn | Eagle | Colin | Adam | Coffee Pots | Barry | The Marklin Engine | Billy | Hiro | Bash and Dash | Ferdinand | Flora | |
Rolling Stock | Coaches | Annie and Clarabel | Henrietta | Alice and Mirabel | Isabel and Dulcie | Victoria | Old Slow Coach | Slip Coaches | Hannah | Dexter | Express Coaches | Branch Line Coaches | Old Coaches | Thomas' Special Coach | Emily's Coaches | Toby's Museum Coach | Flora's Tram Coach | Open-Topped Carriages | Ulfstead Castle Coaches |
Trucks | Troublesome Trucks | S.C. Ruffey | Fred Pelhay | James' Trucks | Thomas' Trucks | Plank Trucks | Quarry Trucks | Utility Trucks | The Calliope | Mine Trolleys | Hoppers | Hector | Vans | Mail Vans | Utility Vans | Animal Wagons | Tankers | Flatbeds, Conflats and Wellwagons | Misty Island Log Trucks | Ladle Trucks | The Traveller | Aquarium Tank Wagons | |
Brake Vans | Brake Vans | The Spiteful Brake Van | Toad | |
Other | The Breakdown Train | Rocky | Judy and Jerome | The Circus Train | The Funfair Train | The Flying Kipper | Gordon's Snow Machine | Pump Trolley | The Photographer's Draisine | |
Non-Rail Vehicles | Kevin | Cranky | Carly | Big Mickey | Reg | |
People | Sir Topham Hatt (Stephen Hatt) | Albert Regaby | Kevin Volley | Old Bailey | Mr. Conductor | Mr. Arkwright | Mr. Perkins | |
Lines | The Main Line (Loop Line) | Ffarquhar Branch Line | Arlesburgh Branch Line | Brendam Branch Line | Kirk Ronan Branch Line | Peel Godred Branch Line | Norramby Branch Line | Bluff's Cove Branch Line | Great Waterton Branch Line | Misty Valley Branch Line | Killdane Branch Line | Crosby Branch Line | Ulfstead Branch Line | Harwick Branch Line |