Thomas the Tank Engine Wikia

Dart is a small diesel engine who assists Den in running the Vicarstown Dieselworks.


Thomas & Friends

In Day of the Diesels, Dart complained about needing a new crane and hid Flynn's hose in the rubbish by order of Diesel 10.

Later on, he went with Thomas, Den and Diesel to Misty Island in search of a Christmas tree for the Dieselworks. Dart later teased Flynn for spraying Edward and his driver.

He and Den then helped Thomas fix Ol' Wheezy and later fixed Gordon's bufferbeam.

In the eighteenth series, he hid from Paxton along with Diesel, Den and Sidney causing Paxton to make an island-wide search for them.

At one point, Mavis had an accident, and Den was forced to replace her at the quarry. Dart was distraught at being separated from his best friend, and was slow to start repairing Mavis. When Mavis reminded him that the quicker she was fixed, the sooner he could be back with Den, Dart took her advice and soon, Den returned.


Dart works at the Vicarstown Dieselworks supporting and assisting Den. The two have worked together for so long that Dart can often guess what Den is thinking before he can get it out himself. Although not so much the thinker of the duo, he is usually the doer and can be the chattier of the two. He quickly buzzes about the Dieselworks, occasionally bashing, crashing and clanging into things. He can be heard to grumble "Dizzy Diesels!" when something goes wrong. Dart is very able in his work and a valuable team player. Despite being small in size, he is feisty and fast. Dart also likes jokes, sometimes to the annoyance of the other Diesels. If feeling bothered (particularly by the steam engines), Dart is far from devious, but can get grumpy, gruff, irritable, cantankerous and sometimes cheeky too, but otherwise he is the quick-witted assistant of the Dieselworks.

Technical Details


Dart based on the 0-4-0 diesel-hydraulic shunter no. 3207 "Leys" built by W. G. Bagnall. It was the last locomotive built by Bagnall before the firm was taken over by English Electric. It is now preserved on the Foxfield Railway, along with Harvey's basis. Natalie is another member of this class.


Dart is painted yellow and maroon with white lining and the Dieselworks logo on the sides of his cab. He has yellow and black hazard stripes painted on his bufferbeams.


Official Description

From Official Media:[1]

Dart: Dart is Den’s fast and feisty assistant at the Dieselworks. Dart has worked with Den for so long he can read Den’s mind. Together, they run the Dieselworks well. Dart will quickly explain what Den is trying to say. No other Diesels know how to fix an engine as quickly or as capably.

Fun Fact: Dart is based on a 0-4-0 DH Bagnall.

Audio Files


First used Last used Sound Effect
Series 15 Series 18

In the Great Race, Dart blows only one tone of his horn.

First used Last used Sound Effect
The Great Race The Great Race

In the Guess Who? Puzzles segment, Dart is incorrectly portrayed with Bert's horn.

First used Last used Sound Effect
Guess Who? Puzzles Guess Who? Puzzles

Dart has oddly used a similar horn in Den and Dart.

First used Last used Sound Effect
Den and Dart Den and Dart

In one scene in The Big Freeze, Dart is incorrectly portrayed with 'Arry's horn.

First used Last used Sound Effect
The Big Freeze The Big Freeze


  • In the nineteenth series, Dart gained a permanent lamp, standard tail lamp and brake pipes.
  • Dart is the second diesel to have a two-toned horn, the first being Rusty.
    • He is also the first standard gauge diesel to be in this situation.
  • A promotional image of Dart became an internet meme in 2014, mostly being of his face.


“Dizzy diesels!”
―Dart whenever he gets frustrated.
“What he means is...”
―Dart saying what Den means.


* RWS only | ** T&F only | --- Dropped