Series 25.

Season 24 is an upcoming season which will air in 2021.

Characters

 * Thomas
 * Edward
 * Henry
 * Gordon
 * James
 * Percy
 * Toby
 * Donald and Douglas
 * Oliver
 * Stepney
 * Wilbert
 * Emily
 * Rosie
 * Whiff
 * Terence
 * George
 * Stanley
 * Diesel
 * 'Arry and Bert
 * Frank
 * Annie and Clarabel
 * Troublesome Trucks
 * Toad
 * S.C. Ruffey
 * U.L.P.
 * Jerome and Judy
 * Max and Monty
 * Sir Topham Hatt

The rest of other characters are likely to appear.

UK/AUS/NZ

 * Rachel Weisz as a narrator
 * John Hasler as Thomas
 * Keith Wickham as Edward, Henry, Gordon, James, Glynn, Norman, and the Fat Controller
 * Kerry Shale as Diesel, 'Arry, and Max
 * Nigel Pilkington as Percy Trevor and Terence George
 * Rob Rackstraw as Toby, Donald, Monty, and Stepney
 * Christopher Ragland as U.L.P. and the Troublesome Trucks
 * Joe Mills as Douglas, Oliver, and Toad
 * Teresa Gallagher as Emily, Rosie, Judy, Annie and Clarabel
 * Tim Whitnall as Jerome and Wilbert
 * John Schwab as Stanley, Frank, and S.C. Ruffey

US/CAN

 * Rachel Weisz as a narrator
 * Joseph May as Thomas
 * William Hope as Edward, Toby, Whiff, and Iron Bert
 * Kerry Shale as Henry, Gordon, Diesel, Iron 'Arry and Max
 * Rob Rackstraw as James, Donald, Monty, and Stepney
 * Christopher Ragland as Percy, Trevor, U.L.P., the Troublesome Trucks and Terence