Diesel was the first diesel engine to arrive on the Island of Sodor. He is painted black and has six wheels. He first came to Sodor for a trial run, helping Duck. After an embarrassing mistake, Diesel spread mean-spirited rumors about Duck, but once The Fat Controller got to the bottom of the incident, he sent Diesel back. From time to time, Diesel was brought in for help when no spare engines were available. Diesel would usually antagonize the steam engines, and be sent away in disgrace for causing accidents. Diesel eventually became a permanent resident of the railway, and continued to feud with the steam engines. However, his personality has begun to soften. He was silently thankful when Thomas replaced his water-contaminated oil and agreed to help the steam engines to complete an important job for the Fat Controller. Diesel is based on a British Rail Class 08 shunter.
Appearances in Christmas specials[]
- "Thomas and the Missing Christmas Tree" (cameo)
- "The Missing Christmas Decorations"
- "Last Train for Christmas"
- "Diesel's Ghostly Christmas"
- "Kangaroo Christmas" (stock footage cameo)