Arc Productions (formerly known as Starz Animation Toronto) is a CGI and visual effects company based in Toronto, Ontario, Canada who had animated the CGI series from the seventeenth season onwards. They took over from Nitrogen Studios. David Baas directed the seventeenth season; David Stoten directed the first ten episodes of the eighteenth season and Don Spencer directed its remainder. Robert Anderson produced the seventeenth season and the first half of the eighteenth season, with Brian Lynch taking over as producer from the second half of the eighteenth season. King of the Railway was directed by Rob Silvestri and produced by Brian Lynch. Kallan Kagan, Jeff Young and Steven Hecht act as executive producers for Arc. Jennifer Hill produced The Adventure Begins and will produce the nineteenth season.
Arc has provided the animation for the films "Gnomeo & Juliet" and "Everyone's Hero" and visual effects for films like "Dolphin Tale". The company also helped Big Idea with animating the episodes of VeggieTales from 2004 through 2007, and their second feature film "The Pirates Who Don't Do Anything: A VeggieTales Movie". They also provided the animation for "9", directed by Shane Acker who was to direct The Adventures of Thomas.
- When Nitrogen passed on their sets to Arc, some were missing information needed for production. This meant that some sets had to be completely rebuilt based on pictures to make them look identical to their Nitrogen counterparts. The Sodor Search and Rescue Centre is one of these sets.