Arc Productions (formerly known as Starz Animation Toronto) is a CGI and visual effects company based in Toronto, Ontario, Canada who animates the CGI series from the seventeenth season onwards. They took over from Nitrogen Studios. David Baas directs the series, while Robert Anderson produces. However, King of the Railway was directed by Rob Silvestri and produced by Brian Lynch. Steven Hecht, Kallan Kagan and Jeff Young act as executive producers for Arc Productions.
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 with Big Idea animating some of their episodes, such as "Moe and the Big Exit", "The Wonderful Wizard of Ha's", 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 WWII Movie", due for release in 2014/2015.
- 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.