Emily/Behind the Scenes

Gauge 1 model
Emily's model was scratch-built to run on gauge 1 track. Ten 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.

Emily has had modifications throughout the model era. These include:
 * In the eighth series, Emily's bronze buffers were changed to silver ones.
 * Emily had many modifications throughout the television series. These include:
 * Series 8:
 * Her buffers changed from bronze to silver.
 * She shares the same whistle sound as Henry.
 * Series 9:
 * She had Edward's fourth series whistle sound. This whistle sound was used until the twelfth series.
 * Series 11:
 * Her forward buffer housings' colour changed from black to red.
 * The colour of her running board changed from dark grey to light grey. Presumably, this was done to match her running board colour to the other engines in the steam team.
 * Series 12:
 * Her face became larger.

One of Emily's models used to be on display in Canada at Nitrogen Studios.

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

Photographs of Emily'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.

Emily has had modifications throughout the CGI series. These include:
 * Hero of the Rails:
 * Her face became a bit thinner.
 * Her whistle sound is the same as Henry again.
 * Series 13:
 * Steam incorrectly emits from her safety valve.
 * Tree Trouble:
 * Steam no longer comes out of her safety valve.
 * No Snow for Thomas:
 * She gains a permanent headlamp and tail-lamp, as well as lamp irons.
 * She gains a new whistle sound.
 * Series 19:
 * She gains brake pipes.
 * She received more prominent front and rear brake-pipe outlets. Strangely, the front ones that have been there since she was introduced have not been removed.
 * Her side rods became silver.
 * Snow Place Like Home and parts of Best Engine Ever only:
 * Her brake pipe faces downwards.
 * Series 23:
 * She gains an additional handrail above her smokebox connecting both her side handrails, much like her basis and original concept art.
 * She gains guard irons in front of her wheels.
 * The rear of her tender now has yellow lining.
 * She gains rivets on her bufferbeam, coupling hook base, her cab front and side, buffer bases, her cylinder heads, the sides of her front bogey, the section inbetween her cylinder and wheel arch, the sides and back of her tender and around her smokebox and cylinder sides.

Voice Actors

 * Teresa Gallagher (UK; Hero of the Rails onwards)
 * Jules de Jongh (US; Hero of the Rails onwards, UK; Thomas and Friends in 4-D: Bubbling Boilers and The Great Race singing voice only)
 * Blanche Ravalec (France and French speaking Canada; seventh series onwards)
 * Yuka Shioyama (Japan; seventh and eighth series)
 * Erina Yamazaki (Japan; Calling All Engines! onwards)
 * Marit Berg (Norway; Hero of the Rails - seventeenth series, excluding Day of the Diesels, Blue Mountain Mystery and King of the Railway)
 * Marianne Westby (Norway; Day of the Diesels - Tale of the Brave, excluding the fifteenth - seventeenth series)
 * Chiara Gioncardi (Italy)
 * Diana Pérez (Latin America; Hero of the Rails onwards)
 * Marjolein Algera (The Netherlands)
 * Kristina von Weltzien (Germany)
 * Judy Winter (Germany; Audio Books only)
 * Joanna Pach (Poland; Hero of the Rails onwards)
 * Mia Kadosh (Israel)
 * Kate Kelly (Brazil)
 * María Sánchez (Spain)
 * Susa Saukko (Finland; Hero of the Rails onwards)
 * Ioana Perneș (Romania)
 * Thanh Hống (Vietnam)
 * Haffner Aniko (Hungary)
 * Olga Kuznetsova (Russia)
 * Kim Eun-a (South Korea)
 * Elain Llwyd (Wales)
 * Vina Papadopoulou﻿ (Greece)