Chocolate is a brown E2 tank engine just like Thomas the tank engine, but painted in a different livery.
He was rescued from a scrapyards at Barrow-in-Furness and Diesel brought him to Sodor to the works. After Chocolate had been restored, he had shunted Smudger to the Skarloey railway engine sheds to be loaded onto the narrow gauge railway with the help of Skarloey. Afterwards he left back to the works to help Spencer the other railway steam engine who told lies about Chocolate and Sir Topham Hatt sent him away to the scrapyards. Chocolate is usually based at the works, but is always called away to help others at many places incase they are struggling to find other engines.
- Donald9andDouglas10 created Chocolate to have the same personalities and traits like himself in real life.
- Donald9andDouglas10 named Chocolate after his favorite flavor of ice cream.
- Chocolate's number is a Star Wars reference.