- “Whistles are for safety, not for playing games!”
- ―Sir Topham Hatt
Percy's New Whistle is the second episode of the eighth series.
Whilst delivering trucks to the quarry, Percy whistles a greeting to 'Arry and Bert, who laugh at Percy's whistle. Percy is determined to show the diesels that his whistle is just as good as their horns. As Percy puffs through the countryside, he practices whistling loudly. Later, he goes back to the quarry and sneaks up behind 'Arry and Bert. He blows a great toot on his whistle, which startles the two diesels.
Now that he has a super-loud whistle, Percy cannot wait to use it again. When he sees Thomas in a siding, he blows another loud whistle. Thomas jumps forwards and biffs into his trucks, making him cross but Percy is too busy having fun to notice. Later, when he sees Bertie, Percy lets off another loud whistle, startling Bertie as he swerves across the road and into a snowy ditch, also making him cross as well but Percy does not realise this.
That evening, Thomas tells Percy about all the trouble he had caused that day. Percy apologises and promises never to do it again but, the next day, while steaming through the countryside with a milk train, he wishes that he could have one last loud toot on his whistle. Percy does not see anyone about, but he does not know that Terence was delivering food to feed some sheep on the hill above. Percy's loud whistle startles Terence and he jolts backward and knocks a log down the hill. The log collects snow and turns into a giant snowball as it rolls down and crashes into Percy at the bottom of the hill. Percy's driver was cross as he is forced to call for help.
Soon, Sir Topham Hatt arrives on board Thomas with Judy and Jerome and tells Percy not to use his whistle inappropriately. Percy promises to only use his whistle when the time is right. The next day, Percy is a very quiet engine. But, as he comes out of a tunnel, he spies a snowdrift on the line. Then, he hears Thomas approaching. Percy blows a warning whistle and Thomas grinds to a halt just in the nick of time. Percy is praised by Sir Topham Hatt and now only uses his whistle responsibly.
- 'Arry and Bert
- Sir Topham Hatt
- Judy and Jerome (do not speak)
- Terence (does not speak)
- Henry (cameo)
- James (cameo)
- Toby (cameo)
- Daisy (cameo)
- Annie and Clarabel (cameo)
- Farmer Finney (cameo)
- Ffarquhar Quarry
- Ffarqhuar Sheds
- Hackenbeck Tunnel
- Tidmouth Tunnel (stock footage)
- The Watermill (deleted scene)
- Sodor Dairy (mentioned)
- The Smelter's Yard (mistakenly mentioned)
- Stock footage from Snow Engine is used.
- In some versions of this episode, Bertie's eyes are animated using CGI after he crashes and the chuffing sounds and James' whistle heard when Henry and James pass each other is different.
- In the long shots of Percy blowing his whistle, the steam coming from his whistle use CGI.
- In the All Aboard with the Steam Team DVD, the timing of Thomas saying, "Cinders and Ashes" and "Thank you Percy!" is a few seconds early than the other UK DVDs and individual television broadcasts. Also when Percy whistles a second time at the end of the episode, his whistle is a long note.
- Bert's horn is a lorry horn sound.
- Percy has been given a new wincing face mask which only appears in this episode.
- This was the very first time that steam engines are addressed as "steamies," which would become used more often in following seasons.
- When James blows his whistle, the steam is emitting from his dome, not his whistle.
- Daisy has Diesel's horn sound.
- The quarry is mistakenly referred to as the Smelter's Yard at the start of the episode.
- 'Arry and Bert start to shake before Percy blasts his whistle at them. Bert's face is also crooked in this scene.
- In a close up of Percy's whistle blowing at 'Arry and Bert, it still looks as though Percy is moving even though he stopped alongside the two diesels.
- When Trevor backs into the logs, his back wheels are not moving.
- When Trevor jumps at the sound of Percy's whistle, he reverses without his driver.
- It is said that Terence's trailer hit the logs, but it is really his coal bunker that hit the logs, and he is not pulling a trailer.
- When the two logs roll away, the ground moves.
- When the snowball hits Percy, the log is nowhere to be seen.
- When Percy saves Thomas from running into the snowdrift, Thomas' mouth was covered in snow. But in the next scene it disappears.