This is Number 21

Arthur is a big tank engine originally from the LMS and he was bought to Sodor for his "spotless" record.
Appearances
- Season 2: James' Tender Trouble, Disaster on Sodor
- Season 4: Arthur Helps Out
- Season 9: Tender Bender, Arthur and the Fights of the Brown Turntable
- 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), Ace in the Hole (cameo), Finding Lorry
Specials:
Backstories
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.
Once, Stanley found Thomas and a huge celebration started! Arthur told Emily that Thomas was found and the engines gave a big cheer when Thomas arrived back at Great Waterton!
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.
Basis

Arthur is based on a LMS Ivatt Class
- Characters
- Protagonists
- Tank engines
- Steam engines
- North Western Railway
- LMS
- Red Engines
- Red
- Brown Engines
- Male Engines
- 2005
- No 21
- Brown
- Maroon
- Engines
- Males
- Vehicles
- Standard Gauge
- The Television Series Characters
- 2-6-2
- Television Only
- Coal
- 10 Wheels
- Introduced in 2005
- Retired in 2009
- 2005-2009
- Retired Items
- Wooden Railway
- Red Characters
- Maroon Engines
- Front Magnets
- Male Characters
- Steam Locomotives
- Engines with Whistles
- Television Series Only Characters
- Learning Curve
- 2005 Debuts
- Merchandised Characters
- Model Series Characters
- LC99125
- Introduced
- TV Series
- Boy
- Red Tank Engines
- Maroon Tank Engines
- Brown Tank Engines
- Television Series
- Male Vehicles
- Bogies Rotate
- Items
- Red Vehicles
- Brown Characters
- Brown Vehicles
- Maroon Characters
- Keekre24
- Model Series Only Characters
- No XXI
- On Rail Vehicles
- TV Series Only Characters
- Red Items
- Brown Items
- Red Retired Items
- Brown Retired Items
- Circle Faces
- Red Merchandised Characters
- Brown Merchandised Characters
- Rail Vehicles
- Characters with Whistles
- Characters That Make Sounds
- Thomas and Friends Characters
- Characters that go on Rail
- Non Try Me
- Characters that don't work
- Red Characters that go on Rail
- Rail Characters
- Rail Items
- Television Series Characters
- Male Characters that go on Rail
- Characters with Faces
- Engines with Faces
- Red Steam Engines
- Red Characters with Faces
- Red Bufferbeams
- Vehicles with Faces
- Male Characters with Faces
- TV Series Characters
- Wooden Railway Characters
- Circle Buffers
- Male TV Series
- Merchandised Characters with Faces
- Merchandised Engines
- Merchandised Vehicles
- Red Standard Gauge
- Introduced Characters
- Introduced Items
- Brown Standard Gauge
- Male Items
- Merchandised Characters that go on Rail
- Merchandised Items
- Wooden Railway Items
- Wooden Railway Characters that go on Rail
- Wooden Railway and Wood
- TV Series and Non TV Series
- North Western Railway Characters
- TV Series Characters with Faces
- Wooden Railway Characters with Faces
- TV Series Characters with Whistles
- TVS
- Brown or Red
- TVS Characters
- NWR
- On Rail
- TV Series On Rail
- Introduced in Season 7
- Male On Rail
- Model Series On Rail
- Model Series
- Classic Series
- Locomotives
- Red On Rail
- TVS Only
- Items with Faces
- Toy Characters
- TVS and Non TVS
- WR
- Characters that go on the Tracks
- Faced Characters
- TV HiT Series
- Model HiT Series
- Characters with Merchandise
- Brown On Rail
- Merchandising Characters
- On Rail Characters
- TV Characters
- Merchandised Characters that go on the Tracks
- Wooden Railway Characters that go on the Tracks
- Characters with Wheels
- Characters with a Face
- Characters who are on TV
- X Wheels
- CGI Series Characters
- Vehicles with a Face
- Characters with a Cab
- Characters with Nameboards
- Merchandised Characters with a Face
- Television Series On Rail
- Characters with Windows
- Faced Television Series Characters
- Characters who Appear in Keekre24's Series
- Male TV Series Characters
- Characters with a Roof
- Characters with a Circle Face
- Numbered Characters
- Characters with a White Face
- Characters with a Number
- Characters that go on the Tracks and Road
- Characters with a Red Bufferbeam
- Characters with a Whistle
- Characters with a Funnel
- Characters with a Window