Arthur is a big tank engine originally from the LMS and he was bought to Sodor for his "spotless" record.
- Season 12: Greetings, Montague!
- Season 13: It's Good To Be Belle
- Season 14: Hiro and the Heat Wave
- Season 16: Bulstrode Barges In, Marion Had a Little Lamb (does not speak), Painting the Rosie's Red (cameo)
Arthur was sent to the North Western Railway because of his "spotless" record. Thomas and Percy were sent to work with him by Sir Topham Hatt, Thomas and Percy, however, bumped trucks which Arthur did not want to join in, he had never been troublesome or ever caused an accident. However, his first job was to take fruit to the market.
Thomas the tank engine wanted to play a trick on Arthur, he told Arthur that Sir Topham Hatt did not like the trucks singing and he wanted them to stop. Arthur, however, took Thomas' advice and tried making them stop singing, however, Arthur's "spotless" record was ruined after a crash on Gordon's Hill splattering fruit everywhere! However, the "spotless" record turned "fruitless" to Sir Topham Hatt! However, Thomas apologized to Arthur at the Washdown.
Once, Arthur was sent to the Fishing Village to work with Thomas. Arthur thought it would be exciting but was sad when Thomas was to work there, Thomas did not like working at the Fishing Village though one bit. However, he was shunting trucks and accidently veered onto a wrong turn on the bridge and crashed into the sea while the trucks still standed on the rails! Arthur was sent to help Thomas out of the sea by Sir Topham Hatt and the two soon huffed and puffed out of the Fishing Village!
Later on, Thomas was sent to push trucks full of fish, Thomas was not pleased with the job of pushing trucks full of fish, however, Thomas was so aggravated about the job. But suddenly, did not notice about Salty ahead on the line and crashed into him! The fish was everywhere and was on the rails, also.
Percy once was waiting for Arthur to pass by the line, Arthur tried pushing and tried doing his best towards it. However, was pushing the hardest he could along the way, he pushed... and pushed... and pushed until the pushing ended, Arthur stopped the pushing along the way and stopped the pushing after a whole line of pushing and soon Thomas set after the runaway car.
Arthur is a big tank engine, the biggest tank engine Sodor has ever seen! Arthur was sent to Sodor because of his "spotless" record about never being troublesome or never causing an accident.