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Troublesome Trucks (Foolish Freight Cars or simply Cars in the US) are so nicknamed because they can be quite troublesome and love to play tricks on the engines, except Edward, Stepney, Hiro, and Salty. The trucks have been the cause of most of the railway's accidents. However, since Douglas smashed the Spiteful Brakevan and Oliver pulled S. C. Ruffey, their leader, apart, they have been frightened of some engines.
There have, however, been some cases where the trucks and engines are on the same side, such as when Percy told them to push him past a danger sign and into the water or when Diesel was given a third chance on Sodor, but the trucks tricked him into misbehaving and getting sent away again.
Trucks could be considered the rebels of the railway, as most of them love to cause mischief and trouble. They will play tricks on an engine based on how they treat them. Most accidents caused by the trucks are a form of revenge due to mistreatment; they will carry out their plans even if they result in the trucks being damaged or destroyed. If an engine is having a bad day, makes a mistake, or is easily played upon, then the trucks begin their wild antics of singing, name calling, holding back, shoving, bumping, giggling and so on.
Trucks can also be described as territorial; when they get used to certain engines pulling them, another engine in the yard to take them may cause confusion or anger for the trucks. In Percy's Predicament for example, Toby and Percy switched jobs, making Toby's trucks furious and causing Percy to crash.
During the thirteenth season and sixteenth, they behaved but were easily annoyed. From King of the Railway onwards, they have gone back to their old personalities, misbehaving and causing accidents.
The Troublesome Trucks are mostly 7 plank and 8 plank end door open wagons. The van variety are mostly BR 12 ton twin ventilated and BR 12 ton single vent vans with corrugated ends.
Trucks are traditionally painted either dark grey, dark green, or brown with black frames, although in recent years, they have also appeared in red, green, blue, pink, and many other colours. Privately-owned trucks typically have their own specific livery.
Trucks are mostly utilised for the transportation of quarry rock and coal. Due to their ubiquitous nature on the railway, they have been employed for carrying a variety of other materials, such as wood, sand, china clay, bricks, and even debris after large storms. From the eighth season until the sixteenth season, they were used to transport specific goods which would be better suited for closed wagons; some of these goods include books, cocoa powder, presents, and raw fish.
- Neil Crone and Kevin Frank (Thomas and the Magic Railroad; cut from final film)
- Ben Small (UK/US; sixteenth season - eighteenth season)
- Christopher Ragland (UK/US; The Adventure Begins onwards)
- Thierry Kazazian (France and French speaking Canada)
- Shinobu Satouchi, Kōzō Shioya, Yasuhiro Takato, Kōhei Miyauchi, Yūki Satō, Yasuhiko Kawazu, Katsuji Mori, Toshio Kobayashi, Naoki Tatsuta, Hisao Egawa, Yasunori Masutani, Tetsu Inada, Naoki Kinoshita, Moriya Endo, Tomohisa Asō, Ryōtarō Okiayu, Hiromi Nishida, Noriko Shitaya, Mitsuhiro Sakamaki, Chie Kōjiro, and Nobuaki Kanemitsu (Japan)
- Sarah MacDonald Berge, Marianne Westby, Øyvind Borgemoen Lyse, and Espen Sandvik (Norway)
- Caspar Phillipson (Denmark)
- Bruno Mello and Caio Guarnieri (Brazil; eighteenth season onwards)
- Trucks are never named; however, those that are privately owned tend to take on the name of their owner, like S. C. Ruffey, Fred Pelhay, U. L. P., Bennett and Co. and possibly Rickety.
- From the sixth season onwards in the US, the term "truck" is used more often. In more recent seasons, however, the US has been more consistent in using the term "car", unless referring to the trucks with faces.
- In the first season of the television series, the trucks had their faces embedded into their bodies, much like Annie and Clarabel. From the second season onward, they were given face masks to allow a greater variety of facial expressions.
- The trucks were to have a larger role in Thomas and the Magic Railroad, but they were cut from the final film.
- From the twelfth season onwards, all the troublesome trucks have the same face design. In addition, the black and grey trucks are the only trucks to have faces.
- Since the CGI switchover, the open-topped trucks have become taller.
- During the fourteenth and fifteenth seasons, the trucks didn't have faces. They regained them in the sixteenth season.
- Until King of the Railway, the Troublesome Trucks caused no accidents after the ninth season episode, Emily Knows Best, and had no speaking roles after the twelfth season.
- According to the Railway Series book, Oliver the Western Engine, ballast trucks are considered to be the worst of all.
- Some facemasks of Toad, Bulstrode, and the Spiteful Brakevan have been seen on the trucks.
- Ever since the New Series started, only the open wagons are depicted as "Troublesome Trucks".
- In both the UK and US narrations of the CGI series, the trucks have American accents, apart from one truck in Tale of the Brave who had an English accent.
- From season 1 to season 5, the wagons and Troublesome Trucks used in the TV series were made out of modified Tenmille gauge 1 kits. Tenmille still makes these trucks today. From season 6 onwards, the trucks were scratch built .
- ERTL (normal, miniature, brown livery and Gold Rail; all discontinued)
- Wooden Railway (normal and talking)
- Take Along (discontinued)
- Take-n-Play (normal, talking, blue, and red)
- My First Thomas
- Lionel Trains
- Bachmann (HO and large scale)
- Motor Road and Rail (discontinued outside Asia)
- LEGO (discontinued)
- TrackMaster (various colours)
- Trading Cards (discontinued)
- Hornby (discontinued)
- Thomas Engine Collection Series (discontinued)
- Mini Die Cast Collection (discontinued)
- Departing Now (discontinued)
- Thomas Town (discontinued)
- My Thomas Story Library (discontinued)
- Tomix Trains
- De Agostini (discontinued)
- Brio (discontinued)
- Tomica (with Percy)
- Wind-up (normal and metallic)
- Pocket Fantasy (discontinued)
- Mega Bloks (discontinued)
- Departing Now
- Boss (discontinued)
- New Block
- Collectible Railway