Arthur is a big maroon tank engine from the LMS.
Arthur is a big new tank engine whose job is to shunt trucks and pull freight. He is as excited to work for the Fat Controller as he is proud of his famous spotless record. Only time will tell if that record will stay as spotless as Arthur would like. 
Arthur took great pride in his spotless record, which he soon lost after colliding with Duck's trucks in an incident largely provoked by Thomas; however, this spotless record was soon amended, after Thomas apologized to him for causing the accident.
He was bought to shunt and pull goods, but then was transferred to the coastal run, on which he enjoys working. He is responsible for this line, which is famous for its fish. He and Salty are the only known engines that enjoy the smell of fish.
Arthur is a reliable, kind and helpful engine, and often careful to get his jobs done without fuss or mess. When he first arrived he proved to be somewhat gullible - something which Thomas used to his advantage. He dislikes things that are new and different.
Arthur is based on an LMS Ivatt Class 2MT 2-6-2 tank engine developed for the London Midland and Scottish Railway.
- Nathan Clarke (UK/US; coming soon)
- In some episodes he wears Emily's shocked face, this can be also spotted in a ninth series game, called Arthur's Tricky Travels.