Diesel 10

Diesel 10 is a diesel locomotive owned by the Fat Controller, working on the North Western Railway. Throughout the series, he becomes the main antagonist of "How Diesel 10 Stole Christmas," the longest episode of the entire series.

Bio
Many years before the events of the series, 'Diesel 10's brother, Jerry, is killed by Lady one Christmas. After that, he developed a hatred for steam engines, due to the actions of one so many Christmas' ago.

Personality
He's quite a big jerk when he was first introduced, but later on became an antihero, not being a villain or a hero.

Appearances

 * How Diesel 10 Stole Christmas
 * How the Claw Came to Be

Trivia

 * Both of the episodes he has appeared in have began with the word "how" in the title.
 * Diesel 10 gets the last line of the series so far, excluding the narrator: "Shut up, I wanna go to sleep."
 * Diesel 10 was confirmed to be an Atheist after he supports Christmas.