• Spencer
  • Neville
  • BoCo
  • Derek
  • Dennis
  • Norman
  • Den
  • Dart
  • Happy Hook
  • Sir Topham Hatt
  • The Duke and Duchess of Boxford
  • Diesel (cameo; seen at the Dieselworks)
  • Salty (cameo; seen pushing trucks at Brendam Docks)
  • Paxton (cameo; seen at the Dieselworks)
  • Rusty (cameo; seen pulling trucks on the Skarloey Railway)
  • Fred (cameo; seen pulling trucks on the Skarleoy Railway)
  • Zazu the Blue Narrow-Gauge Diesel (cameo; seen pulling trucks on the Skarloey Railway)


UK and US

  • Mark Moraghan as the Narrator
  • Matt Wilkinson as Spencer and the Duke of Boxford
  • Steven Kynman as Neville, Derek, Dart and Happy Hook
  • Bob Golding as BoCo and Dennis
  • Keith Wickham as Norman, Den and Sir Topham Hatt
  • Teresa Gallagher as the Duchess of Boxford


  • Mark Moraghan as the Narrator
  • Glenn Wrage as Spencer
  • Steven Kynman as Neville, Dart and Happy Hook
  • Bob Golding as BoCo and Dennis
  • David Menkin as Derek
  • Keith Wickham as Norman, Den and Sir Topham Hatt
  • William Hope as the Duke of Boxford
  • Jules de Jongh as the Duchess of Boxford


Narrator: All the diesels were cheerfully purring about with their coaches and trucks. They were all in good spirits, except for Derek. His horn kept making a strange noise every time he tried to blast it.

Derek's Driver: You need to go to the Dieselworks for a new horn Derek.

Derek: Ah! I'm just glad it's not far.

Narrator: When Derek reached the Dieselworks, Den and Dart inspected his horn.

Den; Ah Derek, this is the problem, your horn has a buckled battery latch.

Dart: We'll have to put a new one in there for you.

Den: And the only spare horn at the moment is right here, if you'd like to see it.

Derek: Yes please, I'd love to.

Den: Happy Hook, please present Derek with the only spare horn we have for the time being.

Happy Hook: Here it comes. (picks up the spare horn)

Derek: (gasps) What the? I wasn't expecting the horn to be that big.

Dart: Ah you see, we forgot to tell you how big it was in the first place.

Happy Hook: So here's your new horn Derek.

Den: How's it feel, eh?

Derek: Quite good.

Dart: You'll enjoy using it Derek, it's a three-blast diesel horn.

Derek: Oh, I don't know. I've never used this sort of horn before.

Narrator: Then BoCo arrived at the Dieselworks with Sir Topham Hatt.

BoCo: Hello Derek. That's a three-blast diesel horn. I used to have one of those.

Derek: Is it a good horn?

BoCo: It's the best. It's the loudest horn in the whole of Sodor.

Narrator: This made Derek even more worried.

Derek: The loudest?

BoCo: Yes, it's loud and booming. Everyone will hear you coming.

Narrator: Derek didn't like this. He didn't like loud and booming sounds. He liked the sound of his old horn.

Sir Topham Hatt: Derek, you must go to Knapford and collect the Duke of Duchess of Boxford. They're waiting, so don't be late.

Salty: Yes sir.

Narrator: So Derek picked up a coach and purred off to Knapford Station with his new three-blast diesel horn.

Derek: I wish I had my old horn back. I don't know how to use this new, loud and booming three-blast diesel horn.

Narrator: Then an idea flew into Derek's engine.

Derek: If I puff slowly and carefully, I won't need to use my horn at all. I can do all my jobs and wait for my old horn to be fixed.

Narrator: This made Derek feel much happier. Derek purred slowly through Sodor. Spencer huffed and puffed impatiently behind him.

Spencer: Out of my way Derek, you old diesel! You're making me late.

(Derek is switched onto the main line, and Spencer steams swiftly past)

Narrator: Later some sheep were on the tracks in front of Derek. He couldn't get past them.

Derek: Go away sheep, please! I need to get through.

Narrator: But the sheep didn't take any notice of Derek. They didn't move. They were too busy baaing and chewing. Derek knew what he needed to do. He needed to blow his new diesel horn. But Salty was too scared.

Derek: I don't want to use my new three-blast diesel horn. I wish I had my old one back.

Narrator: Then another idea flew into Derek's engine.

Derek: I know just what to do. I'd better get help.

Narrator: So Derek reversed down the track to find help. Some farm workers were in a nearby field.

Derek: Excuse me. Hello. Hello?

Narrator: The farm workers didn't hear Derek. Derek blew his exhaust and rattled his rods. But the farm workers still didn't hear Salty. They were too far away.

Derek: Bust my buffers. They can't hear me.

Narrator: Derek knew he should use his new diesel horn, but he was still too scared.

Derek: I wish I had my old horn back.

Narrator: So Derek purred on. Somewhere he had to find help. But Derek couldn't find anybody to help him. So he purred back to the sheep.

Derek: I do hope the sheep have gone back to their field now.

Narrator: But the sheep still hadn't gone. They were still baaing and chewing all over the track.

Derek: Oh no!

Narrator: Salty tried to biff them with his bufferbeam. But they still wouldn't move.

Derek: Oh no driver. I think we're trapped. (gasps)

Narrator: Then there was trouble. Derek heard a noise that made his wheels wobble.

Derek: Another engine is coming! They'll crash into the cows.

Narrator: The engine steamed around the corner. It was Neville. Neville was racing like the wind, his firebox was fuming. And his boiler was burning brightly.

Derek: I have to tell Neville about the sheep. I'll have to use this new whistle.

Narrator: Derek closed his eyes. His engine flared. Power blew into his new three-blast diesel horn. It was the loudest horn anyone had ever heard on Sodor.

Dennis: What was that Norman?

Norman: It was a three-blast diesel horn. They're the best horns ever. I wonder who blasted that.

Narrator: Derek heard the three-blast diesel horn.

Neville: Cinders and ashes! I must stop!

Narrator: He applied his brakes. Neville screeched and skidded. Sparks flew and tracks trembled. Salty didn't dare look.

Neville: Phew. Thank you Derek. Your horn told me there was trouble ahead.

Narrator: Derek felt very proud.

Derek: I'm pleased I used my three-blast diesel horn after all. It was even louder than my old horn.

Narrator: Neville was proud of Derek. Together with their effort, Derek and Neville moved the sheep from the track. Then Derek remembered the Duke and Duchess.

Derek: Trembling tracks! I forgot all about the Duke and Duchess of Boxford. They're waiting for me at Knapford. I must go faster than Spencer to get there on time.

Neville: Don't worry Derek. I'll come with you. We're sure to make it together.

Narrator: Neville and Derek headed towards Knapford Station. Suddenly Neville saw Sir Topham Hatt's car. The owner stepped out. He was very cross.

Sir Topham Hatt: Derek, the Duke and Duchess waited for a very long time. Now Spencer is taking them back to the Mainland.

Narrator: Derel was upset. He knew he hadn't been a really useful diesel.

Derek: I'm sorry sir...

Narrator: Then Derek stopped. He could see a fallen tree across the tracks ahead.

Derek: Spencer's steaming straight towards that fallen tree.

Sir Topham Hatt: Oh no.

Derek: Don't worry sir. I know just what to do.

Narrator: Derek revved his engine and pumped his pistons. He blew his three-blast diesel horn as loudly and boomingly as he could. Spencer heard Derek's horn. He applied his brakes and stopped just in time.

Spencer: Derek! Did you blow that horn so loudly?

Derek: Yes I did. It was my new three-blast diesel horn.

Derek: For a young diesel, you have a lot of power. Thank you.

Duchess of Boxford: Well done Derek.

Duke of Boxford: Hip, hip hooray!

Narrator: Derek couldn't have felt more proud.

Neville: Good job Derek.

Narrator: Yes, very good. So I shall forgive you for not picking up the Duke and Duchess.

Derek: Thank you sir. And thank you everyone.

Narrator: For the next few days, Derek had a good time with his three blast diesel-horn. But it was soon time for him to head back to the Dieselworks. His old horn was ready. It hummed as if it were brand new. Derel was happy to have his old horn back, but a bit sad to say goodbye to his three-blast diesel horn. Dart, Den and Happy Hook had heard the news about Derek saving Neville and Spencer.

Den: Well Derek, it sounds as though you had a very busy few days with your temporary horn. Did you like it?

Derek: Oh yes. It was very useful.

Dart: You can keep it if you like.

Salty: Well my old horn is the best, but I'd be more than happy to use the three-blast one part-time if ever my normal one needs to be repaired again.

Happy Hook: Good for you Salty.