Rosie is a lively little tank engine who idolizes Thomas, which sometimes bothers him. She works as both a shunting engine and a mixed traffic engine.
Rosie began idolizing Thomas to the point of hero-worship and imitation. Though this is said to be the most sincere form of flattery, it only served to irritate Thomas whilst he was trying to deliver a special birthday post train to Alice at High Farm. He even started to try and avoid her, but after Thomas had an accident in the course of delivering this train, Rosie helped him and he came to respect her.
Rosie later helped Thomas shunt trucks until Hector frightened her away.
Rosie was later charged with acting as a back-engine to Emily with the funfair special. Wanting to take the train herself and, thinking she was doing Emily a favour, Rosie succeeded only in creating confusion and delay on a grand scale, but eventually set things right.
Rosie rescued Thomas when his fire went out after playing a game of "splish, splash, splosh". She later let Diesel take her train of flowers which was headed for market.
One day Rosie had a cracked wheel, so Thomas and Butch brought her a new one.
On Sodor Surprise Day, Thomas bumped some coal trucks to surprise Gordon, but ended up surprising her instead. She is later seen being cleaned up with Whiff at the washdown, and joins Gordon and Thomas at Callan Castle to see Harold decked out in bright lights to make Gordon laugh.
Sometime after she was repainted into her red livery, James challenged her to a race. When Rosie realized that there was something wrong with James' brakes, she warned him to go to the Steamworks to have them checked before they got worse. James did not follow her advice, and as a result, when he sped down Gordon's Hill, his brakes would not work, and he went on a runaway until he crashed into the wall at the end of Tidmouth Sheds.
Soon after, James went to the Vicarstown Goods Yard, looking for Henry's train to take to the Mainland. Rosie told him that she knew they were important and that was why Thomas came to take them early.
During Valentine's Day, Diesel bumped her just as Cranky was loading her flatbed with a crate of roses, which ended up crashing on the tracks. Bill and Ben later saw Thomas telling off Diesel, causing the twins to think they were attracted to each other, much to their embarrassment. A bit of teasing and a meet-up with Thomas at the washdown caused her to avoid him for fear of humiluliation, and she wasn't exactly pleased to know that she was heading to the same place he was. After a brief conversation with Edward, she rushed off so fast that she took the shunter's pole with her before it was moved out of the way. Thomas and Rosie ended up front to front at Vicarstown, where they made up for recent events and found that their specials were for Lady Hatt's Valentines surprise.
Rosie is a friendly, respectful and helpful tank engine who likes Thomas very much. She and Thomas like to have fun, and also like to help each other when they are working. Rosie can be described as a feisty, energetic and free-spirited tomboy who is not afraid to do hard work. She loves to race just as much as she loves to be Really Useful.
Rosie also seems very eager to prove her worth, as evidenced by her wanting to help Thomas deliver Alice's birthday presents, or even attempting to pull a special train on her own. As of Season 21, she appears to have become more levelheaded and mature, serving as a voice of reason to James' arrogance. She also stands no nonsense for teasing or rudeness.
Rosie is an SR USA Class 0-6-0T. Fifteen of these engines were sold to the Southern Railway where they were used as dockyard shunters.
From her debut until The Great Race, Rosie is painted lavender with light grey tank panels, gold boiler bands, and red detailing on her wheels and metalwork.
Starting from the twenty-first season onwards, Rosie is painted cherry red with raspberry tank panels and gold lining. She has the letters "NWR" written on her tank panels in gold.
- Teresa Gallagher (UK (thirteenth - sixteenth seasons))
- Jules de Jongh (US (thirteenth - sixteenth seasons))
- Nicola Stapleton (UK/US (twenty-first season onwards))
- Rosie is the first engine of several things:
- The first engine of an American class introduced in the television series, and the second such engine (after Stanley) introduced in the franchise overall.
- The first engine in the television series to have her original livery changed permanently, and the second character in the television series overall, the first being Bulgy.
- The first engine in the series to receive a number who didn't already have one.
- The first engine in the television series to be lettered for the North Western Railway.
- Rosie's model is currently on display at Drayton Manor. Sometime in 2017, a part of her siderod had broken off.
- In Red for Rosie, one illustration incorrectly depicts her with a tender.
- Most merchandise lines depicted Rosie without the lip gloss and blush that she had worn prior to the twenty-first season. Her Bachmann model depicts her in her original livery when she first appeared in the television series and without her permanent headlamp.
- Rosie's whistle is a higher pitched version of Thomas'.
- A magazine fact file states that she works on Thomas' Branch Line.
- Her My First Thomas & Friends' Railway Pals is the first merchandise of Rosie to have her in her new livery.
- Since her debut, Rosie has appeared in every season and special except The Adventure Begins, which was set before she arrived on the railway and the twentieth season, possibly due to her model being reworked for the twenty-first season and Journey Beyond Sodor.
- From the twelfth to sixteenth seasons as well as the tenth and twenty-first, Rosie only spoke in one episode each. The eleventh and twenty-second seasons are the only ones where she spoke in two or more episodes.
- Rosie has both her whistle and connecting rods in different positions compared to her prototype:
- Rosie's whistle is positioned behind her rear dome whilst her prototype has its whistle positioned on the right side of the middle dome.
- Rosie's connecting rods are attached to her middle driving wheels whereas her prototype has its connecting rods attached to the rear driving wheels.
- Her funnel is also taller than her basis.
- Rosie has had a few modifications throughout the television series, these include:
- Season 13:
- Her face became slightly smaller.
- Her funnel and steam pipes became thinner.
- Her lamp-irons were removed.
- A detail on her coal bunker has been pushed in.
- Mid-Season 17 (starting with Percy's Lucky Day onwards):
- She gained a permanent headlamp of the same design as Ferdinand's, mounted in front of her funnel.
- Tale of the Brave:
- She gained a permanent tail-lamp.
- Season 21:
- She received a new faded cherry red livery with "NWR" painted on her side tanks and the number 37 painted under her cab windows.
- She lost her lipgloss and blush, but she still retains her freckles.
- She gained rivets across her cab, side tanks, smoke box, cylinders and the sides of her buffer beam.
- She also received window panes.
- Season 13:
- Rosie is numbered 37 as of the twenty-first season; this number was likely chosen as she is the 37th standard gauge engine introduced in the television series.
- According to SIF, Rosie was intended to have at least one other episode in the twenty-first season. This episode, along with seven others, were cancelled to make way for production of the twenty-second season. Due to this, it is unknown why she was repainted
- Wooden Railway (normal, battery powered; discontinued, holiday versions, early engineers and roll and whistle)
- Take Along (discontinued normal, metallic, and "lights and sounds")
- Take-n-Play (normal, talking; discontinued, and glow racers)
- Collectible Railway
- Motor Road and Rail (discontinued outside Asia)
- TrackMaster (many versions)
- Bachmann (coming soon)
- Mega Bloks (discontinued)
- Minis (classics and DC super friends (Supergirl and Starfire); coming soon)
- My First Thomas
- My Thomas Story Library (discontinued)
- Wind-up (normal, metallic and transparent; Japan only)
- Boss (discontinued)
- Discover Junction
- Bath Toys
- Micro Rubber Engines
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