Mr. Peregrine Percival, nicknamed "the Thin Controller", is the current manager of the Skarloey and Culdee Fell Railways in the television series. In the magazine stories, he also runs a Cable Railway.
Thomas & Friends
Mr. Percival was hired sometime between 2003 and 2005 to help Mr. Peter Sam manage the ever-increasing size of the railway industry on the Island of Sodor.
Mr. Percival is married to Mrs Polly Percival and has five children, including twins Patrick and Pansy. He and his family live in a cottage opposite the Depot.
He was one of the important visitors who attended Dowager Hatt's special tour of Sodor and then a party at Knapford. He later charged Peter Sam with the running of the Skarloey Railway whilst he attended a meeting with Sir Topham Hatt, and welcomed Luketo his railway.
He scolded Duncan for his grumpy disposition at Christmas time. He told Duncan that he had to be cheerful all day, but later realised that demand was too hard for the grumpy engine.
He once attended a meeting with Sir Topham Hatt at Knapford, where he sparked a debate between Thomas, Spencer and Bertie over how many wheels are best, after declaring the two wheels of his bicycle were best. On the way back from the meeting, he called for help when The Duke and Duchess of Boxford needed to get to Callan Castle when Bertie was unable to take them because of a fallen tree. He later attended Sir Robert Norramby's Christmas Luncheon at Ulfstead Castle.
Mr. Percival appears to be acquainted with the Thin Clergyman, as he was seen boarding Thomas' train with him at Kellsthorpe Road, speaking to him at Vicarstown and watching the events of the Great Railway Show with him.
He was one of a group of very important passengers who went on a demonstration run of Hugo.
While Sir Topham Hatt travelled the world looking for Thomas, he left Mr. Percival in charge of the North Western Railway.
Mr. Percival is a tall, thin gentleman. He is usually dressed in a black suit jacket with grey trousers, a yellow waistcoat, a white shirt, a black tie and a black bowler hat. He wears a pair of brown glasses.
Thomas & Friends
- Series 9 - Mighty Mac, Tuneful Toots, Rheneas and the Dinosaur, Duncan and the Old Mine and Skarloey the Brave
- Series 10 - Follow that Flour (mentioned), A Smooth Ride, Duncan Drops a Clanger (cameo), Fearless Freddie (does not speak), Duncan's Bluff, Missing Trucks and Thomas and Skarloey's Big Day Out
- Series 11 - Thomas and the Big Bang, Duncan Does it All, Sir Handel in Charge, Cool Truckings, Ding-a-Ling, Skarloey Storms Through and Wash Behind Your Buffers
- Series 12 - Mountain Marvel, Henry Gets it Wrong (not named; does not speak), The Party Surprise, Duncan and the Hot Air Balloon, The Man in the Hills (does not speak) and Push Me, Pull You
- Series 13 - Hiro Helps Out (not named; mentioned)
- Series 14 - Jitters and Japes (cameo)
- Series 15 - Edward the Hero (cameo) and Up, Up and Away! (cameo)
- Series 16 - Express Coming Through (cameo) and Don't Bother Victor!
- Series 17 - The Switch (mentioned)
- Series 18 - Duncan and the Grumpy Passenger and Duncan the Humbug
- Series 19 - Two Wheels Good and Diesel's Ghostly Christmas (cameo)
- Series 20 - Engine of the Future
He may appear in the twenty-fourth series.
- 2008 - The Great Discovery
- 2010 - Misty Island Rescue (cameo)
- 2012 - Blue Mountain Mystery
- 2016 - The Great Race (cameo)
- 2018 - Big World! Big Adventures!
- 2006 - Pull Together, Really Useful Ride, Station Sounds and Rheneas and the Dinosaur
- 2007 - Uphill and Down and Cliff Ride
- 2008 - Wash Behind Your Buffers!, Ding-a-Ling! (does not speak) and Slip and Slide
- 2009 - Thomas and the Big Bang
- 2010 - Harold Afloat (mentioned) and The Birthday Ride
- 2011 - Going First and Ready Steady Freddie
- 2013 - Don't Bother Victor! (does not speak)
- 2015 - Dusty Rusty and Duncan the Humbug
- Keith Wickham (UK; Blue Mountain Mystery onwards)
- Kerry Shale (US; Blue Mountain Mystery onwards - NZ; Duncan and the Grumpy Passenger only)
- Shoto Kashii (Japan)
- Benjamin Morik (Germany)
- Wojciech Chorazy (Poland)
- Paul Disbergen (The Netherlands; Blue Mountain Mystery - nineteenth season)
- Trond Teigen (Norway; Blue Mountain Mystery only)
- Christian Greger Strom (Norway; sixteenth season only)
- Tony Marot (France and French speaking Canada)
- Carlos Hernandez (Latin America; Blue Mountain Mystery onwards)
- Jukka Voutilainen (Finland; Blue Mountain Mystery onwards)
- In the original UK version, he was generally referred to as Mr. Percival (and to a much lesser extent, the Thin Controller) in season 9, but starting from season 10 and onwards, he is almost exclusively referred to as the Thin Controller. Sir Topham Hatt (aka the Fat Controller) has the same issue. In the US version, Mr. Percival is genderally referred to as his aforementioned real name (and sometimes the Narrow-Gauge Controller).
- Mr. Percival's Take-Along and Take-n-Play toys both feature him inside of a car, whereas he has only ever been seen with a bicycle.
- From the ninth to the eleventh season, the top of Mr. Percival's head was bald. However, since the crossover to CGI in the twelfth season, he has a full head of hair.
- Mr. Percival wears similar attire, with corresponding colours, to the television series Fat Controller's clothes.
- In the model series, Mr. Percival was often accompanied by a workman holding his bicycle.
- The Thin Controller's attire and physical appearance in the 1979 annual may have been the inspiration for Mr. Percival, as they both have the same hairstyle and wear the same clothing and bowler hat.
- Mr. Percival's CGI Series model was reused for the Dockyard Manager in the twelfth season episode, Henry Gets it Wrong.
- Wooden Railway (discontinued)
- Take Along (in red car; discontinued)
- Take-n-Play (in red car; discontinued)
- TrackMaster (with Fearless Freddie in "Ding a Ling"; discontinued)