When Rebecca tells James, he could be a comic-book super-engine, he takes her seriously, and Rail Rocket is born! Thomas helps Ace to overcome his fear of animals and joins Shankar for a fancy dress contest. Meanwhile, Ruth turns an old windmill into an energy-efficient workshop and invents a walking bridge! Cleo's on a mission to save the snow, and Nia's bright idea guides Harold through a storm.
Thomas (voice)
James / Announcer / Toby / Worker (voice)
Percy (voice)
Nia (voice)
Rebecca / Children / Stephen Hatt / Bridget Hatt (voice)
Salty / Gordon / Harold / The Fat Controller / The Thin Controller / Bertie / Various (voice)
Rocky (voice)
Stephen Hatt / Bridget Hatt / Annie / Clarabel / Emily (voice)
Children (voice)
Ashima (voice)
Rajiv / Indian Troublesome Truck (voice)
Shankar / Announcer / Judge (voice)
Noor Jehan / Indian Troublesome Truck / Charubala (voice)
Shane (voice)
Tamika / Crowd (voice)
Aubrey (voice)
Aiden / Australian Bus / Crowd (voice)
Ace (voice)
Daisy (voice)
Skiff (voice)
Sir Robert Norramby (voice)
Ruth (voice)
Sonny (voice)
Henrietta (voice)
Cleo (voice)