Montague (affectionately known as "Duck" because of his supposed waddle) is a Great Western Railway 57xx pannier tank engine. Previously being the station pilot at Tidmouth, he now has his own branch line that runs between Tidmouth and Arlesburgh and is sometimes seen working with Oliver.
In the Railway Series, Duck has two Great Western autocoaches named Alice and Mirabel. Whereas, in the television series he has three Great Western Slip Coaches, collectively nicknamed "Slippies".
Duck is a Great Western pannier tank engine. His real name is Montague, but he is usually called Duck, which he prefers. This is said to be because he waddles, though he does not really. Duck knows how to hold his own and tends to stand for no nonsense from any engines that might get ideas above their station and try to order him or others about. He likes things to run like clockwork, without fuss and is a very efficient, loyal engine. He takes tremendous pride in the responsibilities bestowed upon him, particularly in his role of running his own branch line with Oliver, sometimes known as the "Little Western" as a result.
Duck is cheerful, busy and tends to bustle about. He is very proud of his noble Great Western heritage, often claiming that "there are two ways of doing things: the Great Western way, or the wrong way", occasionally to the frustration of other engines. He strongly admires City of Truro and enjoyed talking "Great Western" with him when he visited the North Western Railway.
Duck is often welcoming of newcomers, even most diesels, in spite of having lies told about him by Devious Diesel not long after his arrival. He will often support the underdog, stick up for his friends and help others see the error of their ways. However, occasionally he does have the "Tank Engine sense" of teasing the bigger engines such as Gordon. Duck is also known to have a rivalry with James. But he has earned the respect of the bigger engines and has firm friendships with Edward, Percy, Oliver, BoCo and the Scottish twins.
Duck is a Great Western Railway 57xx 0-6-0 pannier tank with added sand boxes.
Duck is painted in the GWR's green livery with yellow lining and black wheels, splashers and pipes. He has the letters "GWR" written on his pannier tanks in yellow and red.
In the Railway Series, Duck carries brass GWR number plates on his cab sides (5741) along with a builder's plate on either side of his cab, as well as a gold safety valve cover. Despite his appearance on arrival, it is said in The Island of Sodor: Its People, History and Railways that he was in BR livery, which would make sense for 1955. It is highly likely we would of carried the Lion and Wheel insignia during this period. The Swindon trained Sir Topham Hatt soon allowed him to revert to GWR though, possibly at the same time he was given above running plate sand boxes. It is worth pointing out his number plate is not necessarily the one originally assigned to him during his building.
In the television series, Duck is painted in the North Western Railway's green livery, unlined, green safety valve cover, with black wheels and has a yellow "8" painted on each side of his cab, upon a black background with a yellow box around.
- Season 100 - Coach Brakes, Jealous James, Skiff and the Lighthouse, The Railcar and the Passengers, Oliver and the Coaches, The Crashing Kipper, Mike and James, The Lost Letters (cameo), Snowploughing at Christmas, Ryan and the Snow, Sidney Helps Out, and Skiff and the Dolphin
- Steven Kynman (UK/US; seventeenth season onwards)
- Kōzō Shioya (Japan; second - seventh seasons)
- Kiyonobu Suzuki (Japan; twelfth season onwards)
- Piotr Warszawski (Poland; seventeenth season onwards)
- Jakub Szydłowski (Poland; Sodor's Legend of the Lost Treasure)
- Paul Disbergen (The Netherlands; seventeenth - nineteenth seasons)
- Huub Dikstaal (The Netherlands; twentieth season onwards)
- Sigbjørn Solheim (Norway; seventeenth season only)
- Tony Marot (France and French speaking Canada)
- Oliver Warsitz (Germany; seventeenth season onwards)
- Roberto Gutiérrez (Latin America; seventeenth season - Last Train for Christmas)
- Gerardo Reyero (Latin America; Samson at Your Service onwards)
- Dan Shatzberg (Israel; Sodor's Legend of the Lost Treasure)
- Leopoldo Ballesteros (Spain; seventeenth season onwards)
- Henrique Canales (Brazil; seventeenth season onwards)
- Denis Bespalyy (Russia; seventeenth season - Last Train for Christmas)
- Anton Savenkov (Russia; Samson at Your Service onwards)
- Steven Kynman gives Duck a Cornish accent.
- The Reverend W. Awdry's model of Duck explains his name: when the model for Duck was purchased for Awdry's model railway, it was soon discovered that its wheels were uneven, hence giving him a "waddling" gait. He was promptly christened "Duck" by Awdry's children.
- Unlike most of the characters within the Railway Series, Duck's number was real. The real engine possessing this number was scrapped in 1958.
- In the Greek narration of the Classic Series, Duck is female and is called "Jackie". As of the seventeenth season, Duck has reverted back to his original gender.
- In the French dub, prior to Sodor's Legend of the Lost Treasure, Duck was called 'Duck', instead of 'Canard', the French word for 'Duck'. However, since Sodor's Legend of the Lost Treasure, he is referred to by his real name.
- One of Duck's models used to be on display at Nitrogen Studios.
- Duck has sandboxes, while most of the engines of his class do not. However, they were absent in Percy the Small Engine.
- According to SiF's interview with Sam Barlow, Duck was originally considered to be part of the Steam Team, but was dropped in favour of Emily so as to give a female character a more prominent role.
- His whistle is Trevor's at a lower pitch
- Duck has had many modifications throughout the television series. These include:
- Season 2:
- His gold handrails become white half-way through the season.
- Season 12:
- His face was sporadically smaller.
- His cheekbones disappeared.
- Season 17:
- He increased in size and is subsequently a lot larger than his model form.
- His face returned to its original size permanently.
- His cheekbones returned, though somewhat less prominent.
- His running board was painted black, like it was in the Railway Series.
- Brake pipes and the outlets were added on front and back bufferbeams.
- He gained a lamp and tail lamp. His lamp is now on his sandbox rather than his running board.
- He lost the black sandboxes underneath his running board.
- He also lost the stepladder in the middle of his running board.
- Rivets on his bufferbeam, footplate and cab were added.
- The stepladder underneath his cab was smaller than the one on his model form and real life basis.
- The GWR lettering on his sides has a slightly different font and shadowing.
- He gained black lining around his cab portholes.
- Tale of the Brave:
- His handrails changed to a darker grey.
- Season 19:
- His handrails changed back to white.
- Rivets on his buffer-beam and cab changed to black.
- Season 20:
- He returned to his original size.
- He lost his bufferbeam rivets and brake pipe outlets.
- His buffers are positioned higher.
- His right-hand front buffer is missing its base.
- The shadowing around his bufferbeam detail remains as it was before his resize, and thus is out of place.
- His handrails clip through the front of his tank, this was later fixed in the one-hundreth season.
- His coupling hook base clips through his buffer-beam, this was later fixed in the one-hundredth season.
- Season 100:
- He regained his rivets on both his bufferbeam and cab.
- He lost his left brake-pipe outlet.
- His handrails no longer clip through the front of his tank.
- His coupling hook base no longer clips through his buffer-beam.
- Season 2: