Diesel 10 is a evil diesel engine with a semi-sentient rooftop, hydraulic claw, which he has named "Pinchy".
Diesel 10 once visited the Island of Sodor a long time ago, and caused trouble for the steam engines while he was there. During his visit, he found Lady, the engine responsible for keeping Sodor alive, and chased her, making her crash. Following the accident, Lady's caretaker, Burnett Stone, hid Lady in his workshop and tried to restore her, but he failed to bring her back up to steam.
Several years later, Diesel 10 returned to Sodor when the Fat Controller was on holiday, but this time, he was being possessed by P.T. Boomer's ghost who was intending to destroy Lady once and for all. He was first seen by Thomas and Gordon when he raced past them at Killaban Station, and brought his two lapdogs, Splatter and Dodge, to the railway, who were present when he was scheming. He caused several problems for the steam engines, such as dumping sneezing powder around Tidmouth Sheds and later destroying the scaffolding that had been placed beside the shed.
When Mr. Conductor traveled across Sodor to find the windmill, Diesel 10 found him and held him over a viaduct, intending to drop him. However, Mr. Conductor managed to escape by cutting the hydraulics to his claw with a pair of wire cutters, causing him to fling Mr. Conductor across the island and to the windmill. Diesel 10 was later present at the Coaling Plant, where he was covered in coal when he was teaching Splatter and Dodge “how to stop being stupid”. After Junior flew in the air after riding the windmill's sails, he landed on Diesel 10's cab, who raced across the island and to the smelter's yard, where he tried to push James and Junior into the melting pit. Fortunately, Junior and James managed to escape by using the last of the former's gold dust.
After Lady was brought back up into steam and returned to Sodor, Diesel 10 found her and began to chase her, Thomas, and Burnett across the island, until they reached the viaduct. Lady, Burnett and Thomas managed to cross the viaduct safely, but Diesel 10 was too heavy for the rails, plunged into a barge of sludge below the bridge and was sent away in disgrace.
Diesel 10 is an evil, conniving, bullying, and raving diesel locomotive. He absolutely despises steam engines, and would call them taunting names like "Puffball" and "Teapot". He is Sodor's strongest but not quite largest diesel, his power being enforced by his slightly malfunctioning claw, Pinchy. He can use this deftly, and is even able to use it to make a sculpture. Pinchy, though, seems to have a mind of its own, as it has been shown to "punch" Diesel 10 in the face from time to time, which he hates very much. All engines, steam and diesel alike, fear and respect him.
Despite his aggressiveness, he will help on occasion since Sir Topham Hatt brought him back, but only when it suits his personal interest. He has a caring side, but he very rarely shows it.
Diesel 10 is based on a BR Class 42 diesel-hydraulic with an added non-regulation hydraulic claw. All but two members of the class were named after Royal Navy warships, so they, and the similar Class 43, were nicknamed "Warships". Two of these engines are preserved.
Diesel 10 is painted ochre with tan stripes along his sides. His buffers and "Pinchy" are painted dark brown.
Behind the Scenes
In Thomas and the Magic Railroad, Diesel 10 was originally played by Australian actor Keith Scott, and the character was intended only as a villain supplementary to Doug Lennox's character, P.T. Boomer. Boomer was cut due to early audience reactions, and Diesel 10's role was rewritten as the primary villain. In the process, Keith Scott was replaced by Canadian improv comedian Neil Crone. Crone, with fellow improvisation comedian Kevin Frank, had been auditioning for the film to play the trucks. Crone was given the part of Diesel 10 when he was heard performing a gruff voice during auditions. In the final movie, Crone and Frank improvised much of their dialogue, including the name "Pinchy" for Diesel 10's claw.
His plan in the original script was also much different. He plotted to get rid of the steam engines by making their lives miserable, one of the sections of the plan included the "Sneezing Powder" sequence (originally quarry dust in the original script and Little Engines Can Do BIG Things). He also planned to destroy all the buffers on the railway so the steam engines would crash and derail, with the diesels taking over and rebuilding the buffers after. The plan to destroy the buffers was further bolstered by his discovery of the buffers that led to the entrance of Mr. Conductor's Magic Railroad, thus stopping him from continuing his plans of diesel domination. This plan was the reason why George was going to be one of his assistants. Also, instead of returning to Sodor to finally destroy Lady once and for all, he was a new engine who Sir Topham Hatt brought to help while he was away, but instead caused more havoc on the island.
- Keith Scott (Thomas and the Magic Railroad; original workprints only)
- According to a website called "The Real Lives of Thomas the Tank Engine", Diesel 10's hydraulic claw, Pinchy, is an illegal modification. Among other reasons, it makes him too tall for the British loading gauge.
- In an original version of the Thomas and the Magic Railroad script, Pinchy was going to be concealed beneath Diesel 10's roof. This is kept in the book, Diesel 10 Means Trouble.
- Diesel 10 has never been seen pulling any sort of rolling stock.
- In Thomas and the Magic Railroad, Diesel 10 is only addressed as "Diesel" aside from his introductory scene and the scene where Mr. Conductor explains to Billy Twofeathers why he is going to Sodor.
- It was widely speculated that Diesel 10's name may have derived from the fact that he was the tenth diesel introduced in the television series, but Britt Allcroft says the name just "popped into her mind".
- Diesel 10 was once threatened by Mr. Conductor, of which he was going to put a bag of sugar in Diesel 10's fuel tank, thus clogging up the diesel engine's systems and as Mr. Conductor said to Diesel 10 "It'll cease you up for good", even though Diesel 10 would only need his engine cleaning out to be fully functional again.
- "Get outta my way! I have unfinished business here and I want to finish it fast!"
- "Diesel 10's back! Oh!"
- "Yes, ten out of ten for devious deeds and brutal strength. The blast from the past who hates steam engines."
- P.T. Boomer in Diesel 10's introduction, Thomas and the Magic Railroad
- "Puffball! Teapot!" (falls off the viaduct) "Tin kettle!" (lands in a barge at the bottom)
- P.T. Boomer as Diesel 10 falls off the viaduct, Thomas and the Magic Railroad