Rosie is a tank engine who looks up to Thomas. 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 was 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 favor, 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.
In 2015, Rosie underwent a modification to have a new gold headlamp fitted onto her smokebox. In 2017, she was appointed to be based at Vicarstown, as a shunter and mixed-traffic engine. In an attempt to signify this new stage of her life, she decided to be repainted cherry red due to the colour reminding her of red roses. Rosie loved her new livery much better, as she felt her original lavender and white livery made her look weird, and that she wanted a livery that was more suitable for her. To complete the new look, Rosie had the letters “NWR” painted on her tanks, as well as the number “37” on her cab.
In Journey Beyond Sodor, James went down to Vicorstown Goods Yards and asked Rosie about what happened to the Troublesome Trucks that Henry pulled when he had his accident and Rosie told James that Thomas already took them to Bridlington Goods Yard on the Mainland.
Rosie currently lives at Vicarstown Sheds with Henry, who moved in to help him transition into his new job of being more frequently based on the Mainland.
Rosie is a friendly, respectful, and helpful tank engine. She and Thomas like to have fun and also like to help each other when they are doing work. Rosie could 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 is based on a SR USA Class 0-6-0T. Originally classified as the USATC S100 Class and designed for shunting duties in Europe during the Second World War, after the war fifteen of these engines were sold to the Southern Railway where they were used as dockyard shunters at Southampton. There, they worked alongside the LB&SCR E2s (Thomas' class). Both classes were replaced by BR Class 07 diesels (Salty's class) in 1962, though members of the class remained in service on departmental duties until 1966.
Four members of this class are preserved, one at the Bluebell Railway. Two S100s have also been bought from the former Yugoslavia and modified to USA condition.
From her debut up until The Great Race, Rosie was painted lavender with light grey tank panels, gold boiler bands, red lining and wheels, and light grey wheel rims.
From Season 21 onwards, Rosie was painted faded cherry red with raspberry tank panels, gold boiler bands and light grey lining. She also has the letters "NWR" written on her tank panels in light grey and the number "37" in light grey under her cab windows.
Thomas & Friends
- Series 10 - Thomas and the Birthday Mail
- Series 11 - Hector the Horrid!, Thomas Sets Sail and Thomas and the Runaway Car
- Series 12 - Rosie's Funfair Special
- Series 13 - Steamy Sodor (cameo), Splish Splash Splosh and Hiro Helps Out (cameo)
- Series 14 - James in the Dark (cameo), Diesel's Special Delivery, Merry Winter Wish (cameo), Thomas and the Snowman Party (cameo), Thomas' Crazy Day (cameo), Jumping Jobi Wood! (cameo) and Merry Misty Island (cameo)
- Series 15 - Gordon and Ferdinand (cameo), Toby and Bash (cameo), Percy's New Friends (cameo), Henry's Happy Coal (cameo), Surprise, Surprise (cameo), Stuck on You and Kevin the Steamie (cameo)
- Series 16 - Race to the Rescue (cameo), Ho Ho Snowman (cameo), Flash Bang Wallop! (cameo), Thomas Toots the Crows (cameo), Bust My Buffers! (cameo), Percy and the Calliope (cameo), Salty's Surprise (does not speak), Sodor Surprise Day, Muddy Matters (cameo), Whiff's Wish (cameo) and Happy Birthday Sir! (cameo)
- Series 17 - Steamie Stafford (cameo), Henry's Hero (cameo), The Thomas Way (cameo), Percy's Lucky Day (cameo), Bill or Ben? (cameo), Away From the Sea (cameo) and No More Mr. Nice Engine (cameo)
- Series 18 - Signals Crossed (cameo), Toad's Adventure (cameo), Long Lost Friend (cameo) and Samson at Your Service (cameo)
- Series 19 - The Beast of Sodor (cameo), Very Important Sheep (cameo) and Philip to the Rescue (cameo)
- Series 21 - Hasty Hannah (cameo), The Fastest Red Engine on Sodor and Emily in the Middle (cameo)
- Series 22 - Forever and Ever (cameo; fantasy), Confusion Without Delay (does not speak), An Engine of Many Colours (fantasy) and Rosie is Red
- Series 23 - Chucklesome Trucks (cameo) and Steam Team to the Rescue (cameo)
- Series 24 - A New Arrival, The Great Little Railway Show (does not speak), Nia and the Unfriendly Elephant (cameo) and James the Super Engine (cameo)
- 2008 - The Great Discovery (cameo)
- 2009 - Hero of the Rails (cameo)
- 2010 - Misty Island Rescue (cameo)
- 2011 - Day of the Diesels (cameo)
- 2012 - Blue Mountain Mystery (cameo)
- 2013 - King of the Railway (cameo)
- 2014 - Tale of the Brave (cameo)
- 2015 - Sodor's Legend of the Lost Treasure (cameo)
- 2016 - The Great Race (cameo)
- 2017 - Journey Beyond Sodor
- 2018 - Big World! Big Adventures!
- 2020 - Sodor's Ultimate Railway Showdown (cameo) and Thomas and the Great Centenary
- Series 10 - Navigation and There's Always Something New
- The Great Discovery - Thomas, You're the Leader
- Series 14 - All You Need
- Day of the Diesels - Day of the Diesels
- Series 15 - Hear the Engines Coming
- Series 16 - Go, Go Thomas
- King of the Railway - Working Together Again and It's Gonna be a Great Day
- Series 17 - Hey, Hey Thomas! and On a Journey Today
- Tale of the Brave - Let's Be Brave
- Series 18 - The Best Friends Express
- Thomas' YouTube World Tour - A World Around You, Down by the Docks, It's Great to be an Engine and The Whistle Song
- Series 19 - Engine Roll Call
- Journey Beyond Sodor - I Want to Go Home (cameo)
- Big World! Big Adventures! - Where in the World is Thomas?
- Series 22 - Engine Roll Call, All the Girls Around the World, The Steam Team and Let's Dream
- Series 10 - Which Load for Rosie?
- 2018 - Still the Best of Friends (cameo)
- 2019 - Meet James (mentioned)
- 2020 - Thomas and the Monkeys
- Teresa Gallagher (UK; thirteenth - sixteenth series)
- Jules de Jongh (US; thirteenth - sixteenth series)
- Nicola Stapleton (UK/US; twenty-first series onwards)
- Rachael Miller (Thomas' Magical Birthday Wishes only)
- Hisayo Mochizuki (Japan)
- Simona Pahl (Germany; thirteenth - sixteenth series)
- Natascha Pavia (Germany; Journey Beyond Sodor onwards)
- Micaela Incitti (Italy)
- Justyna Bojczuk (Poland; thirteenth - sixteenth series)
- Aleksandra Radwan (Poland; twenty-first series onwards)
- Talya Barkay (Israel)
- Susa Saukko (Finland; thirteenth - fifteenth series)
- TBA (Finland; sixteenth - twenty-first series)
- Hanna Mönkäre (Finland; Big World! Big Adventures! onwards)
- Lena Meieran (Norway; thirteenth - sixteenth series)
- TBA (Norway; Journey Beyond Sodor onwards)
- Mildred Barrera (Latin America; thirteenth series onwards)
- Blanche Ravalec (France and French-speaking Canada)
- María Rubio (Spain; thirteenth series onwards)
- Marina Sirabello (Brazil)
- Elain Llwyd (Wales)
- Vina Papadopoulou (Greece)
- 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 franchise 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, the second being Rebecca.
- 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.
- This is the first character to have the original livery changed since Bulgy.
- When she had her lip gloss and blush, Rosie rarely had it in various merchandise lines.
- Rosie's whistle is a higher pitched version of Thomas'.
- A magazine fact file states that she works on Thomas' Branch Line, although she is yet to be seen doing so in the television series.
- The My First Thomas & Friends' Railway Pals variant of Rosie is the first piece of merchandise to introduce Rosie's new Season 21 livery.
- Since her debut, Rosie has appeared in every series and special except The Adventure Begins and Series 20.
- 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:
- Series 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-Series 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.
- Series 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 lip gloss and blush.
- She gained rivets across her cab, side tanks, smoke box, cylinders and the sides of her buffer beam.
- Series 13: