Rosie/Behind the Scenes

Gauge 1 model
Rosie's model was scratch-built to run on gauge 1 track. Five different facial expressions were worn by her on screen. The eye mechanism had two servos, one for up and down movement and one for left and right movement.

Rosie has had modifications throughout the model era. These include:
 * 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, which include:
 * Series 12:
 * Her tail-lamp was removed.
 * One of Rosie's models is on display at Drayton Manor.



CGI model
In 2009, the series introduced Computer-Generated Imagery (CGI) as a replacement for the show's long-standing live-action models. Rosie was recreated from scratch in CGI by Nitrogen Studios. Her model was "hand-sculpted" in Maya, a 3D animation and modelling software.​

Photographs of Rosie's Gauge 1 model were used for referencing. According to Greg Tiernan, every detail of the original television series models for each character is carefully reproduced in the CGI model. The models are subjected to many rounds of review before they are submitted to HiT Entertainment for final input and approval.​

Rosie has had modifications throughout the CGI series. These include:
 * Series 13:
 * Her face became slightly smaller.
 * Her funnel and steam pipes became thinner.
 * Her lamp-irons were removed.
 * The detail on the back of her coal bunker is now 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 regained her tail-lamp.
 * Series 21:
 * She received a new cherry red livery with "NWR" painted on her side tanks and the number 37 painted under her cab windows. The area above her wheels and around her ladder was also repainted to gold.
 * She lost her lip gloss and blush.
 * She gained rivets across her cab, side tanks, the sides of her buffer beam and around her smoke box and cylinders.
 * She also received window panes.

Voice Actors

 * Teresa Gallagher (UK; thirteenth - sixteenth series)
 * Jules de Jongh (US; thirteenth - sixteenth series)
 * Nicola Stapleton (UK/US; Journey Beyond Sodor onwards)
 * 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 series onwards)
 * Lena Meieran (Norway; thirteenth - sixteenth series)
 * Mildred Barrera (Latin America; thirteenth series onwards)
 * Blanche Ravalec (France and French-speaking Canada)
 * María Rubio (Spain; thirteenth series onwards)
 * Elain Llwyd (Wales)
 * Vina Papadopoulou﻿ (Greece)