Thomas & Friends: King of the Railway is a 2013 British animated fantasy comedy adventure film and feature-length special of the British television series, Thomas & Friends. The film is produced by HIT Entertainment and animated by Arc Productions, replacing Nitrogen Studios. It is the series’ first production to have CGI animation provided by Arc Productions.

Directed by Rob Silvestri and written by Andrew Brenner with additional material by Sam Wilkinson, the film stars Ben Small and Martin Sherman as Thomas the Tank Engine in the US and the UK respectively. Co-stars include Keith Wickham, Kerry Shale, William Hope and Teresa Gallagher.

Bob Golding, Mike Grady, Jonathan Forbes, Rebecca O'Mara and Miranda Raison join the cast.