(I found the basis for the new character myself: a British Rail Class Warship 43. Credit goes to tate310 for the name of the new character. Thank you very much!)
As dawn broke over the Island, the track from the Vicarstown Bridge was lowered. A large figure swooshed over the bridge and onto the island.
(Vicarstown Bridge allowing access from the mailand to Sodor when a large figure swooshes over. Next scene cuts to Tidmouth Sheds)
As the sky turned bright blue, the doors to Tidmouth Sheds were open and the engines were all waking up when
SWOOOOOSH!
Thomas: (rattling) Cinders and ashes! What was that?
James: (yawning in surprise) I don't know. Don't ask me.
(Donald and Douglas chuffing along the track)
Donald and Douglas were chuffing along the line on their morning run when the large figure flew past them too.
SWOOOOOSH!
Donald: Ach aye!
Douglas: What was a dat you suppoose?
(Duck, Stanley and Rosie shunting truck with in the Shunting Yards with Oliver chuffing beside Toad)
SWOOOOOSH!
Duck: Well, I never…in my Great Western ways…!
Rosie: What was that you suppose?
Bill and Ben had started their morning work with Timothy at the Clay Pits when they were surprised too.
SWOOOOOSH!
And so was Mavis at Anopha Quarry when Toby and Henrietta arrived to drop off the workmen.
SWOOOOOSH!
Toby: Trembling tracks!
Henrietta: Clattering carriages!
Mavis: What in the name of Sodor was that?
(Salty and Porter shunting trucks at Brendam Docks when the large figure swooshes past)
SWOOOOOSH!
Salty: Ah-har! Well, what do you think…?
Porter: What was that?
Cranky: How would I know?!
Spencer was racing along the track when he was surprised by the large figure too.
Spencer: Woah! Slow down! I'm the only engine who should be going at this speed!
Later that morning, the engines gathered at the Shunting Yards.
(Thomas, Percy, Rosie, Stanley, Toby, Duck and Oliver lined up across Spencer, Gordon, James, Henry, Edward, Donald and Douglas)
Stanley: It was big!
Spencer: It was fast!
Edward: It was kinda…kinda…
Then The Fat Controller arrived in Winston.
(Winston honks his horn and The Fat Controller jumps out, walking up to his engine)
Topham: Yes, it was indeed. I've bought a new engine on Sodor.
Thomas: But, sir. Last time I experienced something that fast…
Gordon: Little Thomas and I were surprised by Diesel 10.
Topham: I'm afraid this engine is a bit more modern then Diesel 10?
Thomas: Modern, sir?
Topham: Yes, Thomas. I only bought him here because the diesels needed extra help around at the DieselWorks and this engine would be able to help the diesels with all their jobs.
Percy: What's his name, sir?
Topham: His name…is Irwin.
(Irwin, a British Rail Class Warship 43, zooms into the DieselWorks and slowly brings out his claw)
As Irwin arrived at the DieselWorks and crawled into the sheds, the other diesels looked at him with awe and wonder.
Irwin: Hello, my fellow diesels! It's good to be on Sodor. Where is my brother: Diesel 10?
Splatter: (sighing) Probably oversleeping…(coughing)…boss.
Dodge: But he'll be out soon.
(Doors of Diesel 10 banging and finally opening, releasing Diesel 10)
Diesel 10: (groaning) What is it now, Splodge?!
(Irwin clears his throat, looking at Diesel 10)
Diesel 10: Oh, Irwin. What an honor, my brother. Welcome to Sodor…
Irwin: (sighing) Yes, yes, yes, Diesel 10. Thank you. I'm afraid I'll have to get to work soon but I just wanted to get to know my fellow diesels. So tell me all the news, eh?
Splatter: We do have some news, boss.
Dodge: Directly from the SteamWorks, ahem, boss.
Irwin: What do you mean…directly…from the SteamWorks?
Diesel: (sighing) What these two idiots mean to say is that they've been spying on the steamies discussing to restore some old engine to service.
Irwin: Old engine? I don't think that this island is any place for an old engine.
Diesel: I know. And…
Diesel 10: Wait, wait, wait! What old engine?
Splatter: According to Thomas, this old engine is known as Duke and he disappered a long time ago.
Dodge: And now he is doing all he can to restore this old engine back to service.
Irwin: NEVER! I don't believe in railways run with old engines like this…Duke. And whoever this Thomas is, I'm guessing he's a steam engine, are my methods correct?
Diesel: Yes, indeed. And the trickiest of them all to be honest.
Irwin: Then we must not let him out of our sight! It's time, my fellow diesels, that we took retribution against these steam engines you speak of! They're totally destroying the meanings of this railway with their ambitions to look for such an old engine! Who's with me? (cackling)
(Diesel, Diesel 10, 'Arry, Bert, Splatter and Dodge cackle after Irwin, leaving Paxton worried, Norman and Sidney looking at each other confused and Den and Dart just shrugging and going about their work)