Stepney the "Bluebell" Engine
The first diesel is painted green and cream and had a yellow face. It is based on a BR Class 31 Brush Type 2. 31120 is another member of this class. This diesel's number is D701 and its head code is "4F12".
The second diesel is painted maroon and is based on a BR Class 52 "Western". All diesels of this class were given two-word names, the first word being "Western" and thus the type became known as Westerns.
The Last Diesel
The first diesel
- Over two-hundred-sixty-three of this class was built from 1957 and 1962, twenty-six of these diesel engines survived into preservation.
- Ten more of these engines were in preservation but were scrapped from either accidents or to give spare parts to other engines.
- These diesels were given two nicknames, first being "Toffee Apples" because of the shape of their control lever and the second "Skinheads" because the first few engines didn't have the codebox on the front of the roof.
- The number it carries is completely fictional, None of Class 31's wore this number.
The second diesel
- Over seventy-four was built between 1961 and 1964, seven of these diesel engines have survived into preservation.
- These engines where given the nickname "Westerns" because they commonly worked on the Western region of British Railways.
The last diesel
- Over two-hundred of this class was built from 1958 to 1962. Seven have been preserved.
- These engines were given the nickname "Whistlers" because of the strange whistling noise their engines made.
- The number it carries is completely fictional, none of class 40's wore this number.
- “We stayed there for days, with Diesels baying and growling like hounds. I was very frightened!”
The first diesel was painted with yellow and black "hazard" stripes and appeared to be based on a Class 08. Unlike most Class 08 featured in the Railway Series and the Television series, his/her face appeared to be descending from his/her cab, rather than his/her front end.
The second diesel was painted in British Railways' "Rail Blue" livery with large yellow warning panels, and appeared to be based on a BR Class 28. BoCo and D5705 are also members of this class. He/she appears to be D5701, since that engine was the only Class 28 to be painted in "Rail Blue" during the class' existence.
The Third Diesel
Upon closer inspection of the main line going away from the signal box, a third diesel engine can be seen in the background. Its class is unknown.
The Fourth Diesel
- “Yoohoo! Yoohoo! A steamer's escaping! Yoohoo!”
- ―The fourth diesel
The fourth diesel was from Barrow-in-Furness. It shouted a warning that Oliver was escaping. When Douglas was helping Oliver, Isabel and Toad escape from scrap, he/she witnessed the event. Douglas told the stowaways to take no notice of the diesel. This diesel was not seen in any illustrations, making it unknown what his/her basis was.
James and the Diesel Engines
Several diesels from the Other Railway have visited the Island of Sodor on several different occasions. Visiting diesels are known to be particularly haughty, as they feel superior to steam engines and often put the steam engines down.
Thomas and the Great Railway Show
The diesel is based on a BR Class 08 and painted black which is almost similar to Diesel. Over seventy members of this class survive today in preservation, while around 100 remain in service on the national rail network. They were in fact the most successful shunting engines in the world, with 996 of them built.