Letting Off Steam

"I can't believe I have to do this delivery with you! I don't like doing deliveries with engines who laugh at me!" "You laughed at me!" "'Cause you laughed at me first!" "Well, all I know is that I'm gonna do my half of the delivery on my own!" "That's the first thing you've said today that I agree with!" "Good!" "Fine!"

- Percy and Thomas arguing

Letting Off Steam is the thirty-seventh episode of the first series of Thomas & Friends: All Engines Go.

Plot
Thomas and Percy get into their first big fight and are afraid that their friendship is over, until Nia helps them figure out how to resolve it.

Characters

 * Thomas
 * Gordon
 * Percy
 * Nia
 * Diesel
 * Edward
 * Henry
 * James
 * Emily
 * Annie and Clarabel

Locations

 * Knapford
 * Tidmouth Sheds
 * McColl Farm
 * Blue Mountain Hills
 * Norramby Beach
 * Rolf's Castle
 * Brendam Docks

UK

 * Aaron Barashi as Thomas
 * Will Harrison-Wallace as Gordon
 * Henri Charles as Percy
 * Sade Smith as Nia
 * Henry Harrison as Diesel

US and CAN

 * Meesha Contreras as Thomas
 * Neil Crone as Gordon
 * Charlie Zeltzer as Percy
 * Talia Evans as Nia
 * Shomoy James Mitchell as Diesel

Song

 * Blowing Off Steam

Trivia

 * Going by production order, this is the thirty-eighth episode of the first season.
 * Some Latin American and UK TV guides list this episode as "Frustrated Friends", which could have been the working title.
 * During the song, Nia does her "piston pop" from the first season episode, Capture the Flag.
 * Percy saying "I think I can, I think I can, I think I can" when going up the hill is a reference to The Little Engine That Could.
 * Thomas and Percy falling out is similar to The Railway Series story, Drip Tank, the original series episodes, Thomas, Percy and the Coal and Best Friends, the 2011 special, Day of the Diesels and the 2014 special, Tale of the Brave.
 * The scene where Percy gets hit by a tree branch is also similar to Drip Tank from More About Thomas the Tank Engine.
 * This is the fourth episode to only feature characters from the original series, the first being A Quiet Delivery, the second being Lost and Found and the third being The Can-Do Submarine Crew!. This is also the first episode to feature all the characters from the original and reformed Steam Team with the exceptions of Toby and Rebecca.

Goofs

 * When Gordon arrives at the sheds, Diesel’s eyes are crooked.
 * Nia’s whistle, Carly’s horn and a second horn similar to Philip's from the original series are heard in the traffic jam despite them not being in it.
 * When Nia is asking Percy to help Thomas out of the traffic jam, James is missing his tender.
 * Before Percy leaves Thomas, he mistakenly mentions Brendam Docks when they are going to Norramby Beach.
 * When Thomas tells Percy that he can take the base, and Thomas takes the slide ramp, they switch.