Harvey/Behind the Scenes

Gauge 1 model
Harvey's models were scratch-built to run on gauge 1 track by model maker, Kenny Gittens. The models were made out of brass. They were painted using matte paint and lined with yellow prostripe automotive tape. The numbers and letters were custom printed stickers.

Two models of Harvey were built. One model was track powered, so pick-up contacts were attached to the metal wheels, which ran into the motor to power it. The electricity ran from the track to the wheels/pick-up contacts and went into the motor to power him. The other model was used to power the crane mechanism which was operated by a remote controller.

Both models were fitted with eye mechanism. The eye mechanism had two servos, one for up and down movement and one for left and right movement. The up/down servo was attached to the body. The left/right servo had a rod attached to the arm, which connected to a bracket. The eye balls were coupled to the bracket and locked in by the face-plate, so whenever the servos were powered, the eye balls would move however the crew member desired.

Seven different facial expressions were sculpted for Harvey, although only six were used onscreen. The faces were first sculpted in clay and from that resin casts were made using a silicone mould.

Close-up model
Close-up shots of Harvey's cab was required for scenes in where he had to interact with close-up scale figures. The model was not complete and only portions of the cab were built. Harvey's close-up model only appeared in the ninth series episode, Thomas' New Trucks.

CGI model
In 2009, the series introduced Computer-Generated Imagery (CGI) as a replacement for the show's long-standing live-action models. In 2013, Harvey was created in CGI by Arc Productions. The model was "hand-sculpted" in Maya, a 3D animation and modelling software.

Harvey has had modifications throughout the CGI series. These include:
 * Series 17:
 * He gains permanent head and tail lamps.
 * He gains a brake pipe on his front and back, despite his basis not having one.
 * His coupling hook base is painted black instead of red.

Voice Actors

 * Keith Wickham
 * Hikaru Midorikawa
 * Toshiharu Sakurai
 * Kunihiro Kawamoto
 * Enrique Cervantes
 * Víctor Covarrubias
 * Sigbjørn Solheim
 * Martin Lohmann
 * Roy Martens
 * Konstantin Graudus
 * Paul Disbergen
 * Jacek Król
 * Tomasz Borkowski
 * Leopoldo Ballesteros
 * Denis Bespalyy
 * Haris Grigoropoulos