Mark Moraghan
Narrator (voice)
Martin Sherman
Thomas / Percy (voice)
Kerry Shale
Henry / Gordon / James / Sir Topham Hatt / Workmen / Mr. Percival (voice)
William Hope
Toby (voice)
Maggie Ollerenshaw
Henrietta (voice)
Jonathan Broadbent
Bill / Ben (voice)
Olivia Colman
Marion (voice)
Keith Wickham
Skarloey / The Grumpy Passenger / Passengers / Salty / Dock Worker / Drivers / Guard / Passengers (voice)
Ben Small
Rheneas (voice)
Steven Kynman
Peter Sam (voice)
Matt Wilkinson
Rusty / Passengers / Workmen (voice)
Tom Stourton
Duncan (voice)
David Menkin
Porter (voice)
Tim Whitnall
Timothy (voice)
David Bedella
Victor (voice)
Teresa Gallagher
Annie / Clarabel / Lady with Big Hat / Children
Joe Mills
Welsh Birdwatcher (voice)
Ben Forster
Mr. Perkins
Glenn Wrage
Sir Topham Hatt's Assistant (voice) (uncredited)