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  • Number: 37 (S21 onwards)
  • Class: SR USA
  • Designer: Howard G. Hill
  • Builder: Vulcan Iron Works or H. K. Porter, Inc.
  • Built: 1942 or 1943
  • Configuration: 0-6-0T
  • Top Speed: 35 mph

Rosie is a tank engine who idolizes Thomas.


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.


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 tomboy who is not afraid to work hard.


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.


Television series


Voice Actors


  • 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.
  • In Red for Rosie, one illustration incorrectly depicts her with a tender.
  • 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.
  • 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 - due to continuity.
    • Season 20 - due to her model being overhauled.
  • 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.


  • 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
North Western Railway
ThomasEdwardHenryGordonJamesPercyTobyDuckDonald and DouglasOliverDaisy
Bill and BenHarveyEmilyArthurMurdochNevilleRosieWhiffStanleyHankFloraVictorCharlieBash and DashFerdinandScruffBellePorterTimothyMarionGlynnRyanSkiffDieselMavisDiesel 10'Arry and BertSaltyDenDartSidneyPaxtonNormanPhilipFlynnWinstonStafford

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