Thomas & Friends: Hero of the Rails is a 2009 British animated adventure film and feature-length special of the British television series, Thomas & Friends. The film is produced by HIT Entertainment with animation from Nitrogen Studios. It introduces full CGI animation replacing live-action models, and the addition of a voice cast for the characters alongside the narration to the TV series.

Thomas the Tank Engine is an anthropomorphised fictional tank locomotive in the British Railway Series books by Wilbert Awdry and his son, Christopher, published from 1945. He became the most popular and famous character in the series, and is the titular protagonist in the accompanying television adaptation series Thomas & Friends and its reboot Thomas & Friends: All Engines Go.