Terence/Behind the Scenes

Background Information
Terence is based on a Caterpillar Model 70; the largest and last design of petrol-powered tractors in the Caterpillar Tractor Company's range.

Television Series
Terence was introduced in the first series, reprising his role from the Railway Series. He appeared as a recurring character until the seventh series, and due to the stories focusing primarily on the Steam Team and the Narrow-Gauge engines from the eighth to sixteenth series, he was widely neglected and remained absent for a period of time, save for a minor non-speaking role in the special the Great Discovery.

When the show transitioned into full CGI in 2009, Terence was absent again for eight years. During his absence, in a 2015 interview with SiF, railway consultant Sam Wilkinson expressed his interest to reintroduce Terence into the CGI Series. In 2017, Terence made his return in the twenty-first series episode, Terence Breaks the Ice. He had also played a minor role in the twenty-third series episode, Diesel Do Right when he interacted with Paxton about a delivery of fruits and vegetables being already taken from McColl Farm.

Since his return in 2017, Terence has been voiced by Tom Stourton in both the British English and American English dubs of the series. Stourton gives Terence a Liverpudlian accent.

Gauge 1 model
Terence's model was custom built from perspex for the first series. The model was built to run on Styrofoam road and was painted in glossy car body paint. The wheels and caterpillar tracks were sourced from a Tiger I tank model made by Tamiya. In order to save space inside of the engine, he was not fitted with an eye mechanism, and he had his eyes black-tacked into place.

Terence's model has had minor modifications throughout the the model series:
 * Series 2:
 * He gains additional black lines running across the sides of him.

Present Day
After production of the model series wrapped in 2008, most of the models and sets would be put into storage, with some being put on display at Drayton Manor Theme Park. All other models would be logged and referenced in 2009 by HiT Entertainment, from this HiT would decide on which models were to enter storage once again, which would be given to crew members and which to be disposed off. Due to only having one model made in gauge 1 scale, the model would stay under HiT and later Mattel's ownership.

Terence's model used to be on display at Drayton Manor and is wearing his content face mask. His snowplough is broken around 2010 and his stack has snapped off, but were both repaired and glued in around 2019. In 2022 the model would be returned to Mattel's storage unit in Southampton England for unknown reasons.

CGI Model
In 2009, the series introduced Computer-Generated Imagery (CGI) as a replacement for the show's long-standing live-action models. Terence was recreated from scratch in CGI by Arc Productions/Jam Filled Toronto in 2016 for production of the twenty-first series. His model was "hand-sculpted" in Maya, a 3D animation and modelling software. Photographs of Terence's Gauge 1 model were used for referencing.
 * Terence had some modifications in the twenty-first series, including:
 * Losing his widow's peak and gaining eyebrows, making him resemble his facial appearance in The Railway Series from Toby, Trucks and Trouble onwards.
 * The lining running across his side is removed.
 * His engine is redesigned.
 * His treads are a slightly different design.
 * His face also became more elongated, covering his entire front and lost the small indents it originally had.
 * Gained rivets around his front.
 * His front fender disappeared.
 * His rear drawbar changed in style and he also gained a coupling loop on his front.

Voice Actors

 * Tom Stourton
 * Yasuhiko Kawazu
 * Hinata Tadokoro
 * Manuel Pérez
 * Francisco Klee
 * Michael Griem
 * Reinder van der Naalt
 * Dor Srugo