BoCo the diesel engine was working on Brendam Docks. The Fat Controller was building a new harbour. BoCo enjoyed taking workmen and supplies from place to place. His good friend Edward was helping out as well. The two engines worked hard to ensure that everything was going smoothly.

One day, Henry arrived for the Flying Kipper. Edward went over to Henry and the two engines got to catching up.

"I don't know how you can manage working with a diesel!" Henry said, "I'd ask the Fat Controller to keep him away from me."

"You would like BoCo," said Edward, "He works hard and knows how to keep trucks in order."

"I would never trust one. Especially not after the lies that other diesel spread about Duck."

Just then, BoCo arrived with a work train.

"Hello!" he smiled, "Sorry about the delay, there was a bit of a mix-up at the quarry. The twins have been messing about again!"

"Just as I expected," grunted Henry, "a Diesel engine blaming steam engines instead of accepting fault."

"What do you mean by that?" BoCo was shocked at being addressed in such a manner.

"Just that you diesels are nothing but trouble," said Henry indignantly, "Always spreading lies and trying to get rid of steam engines, "I'll tell you something, I'm not falling for it again."

And with that, he set off.

"What's the matter with Henry?" asked BoCo, "You'd think I'd done something to him."

"Don't worry about it," said Edward, "He thinks all diesels are the same. He'll soon learn. He just needs time."

"I see," said BoCo, "Well I hope it won't take too long. I like working on this railway and wouldn't want to make enemies."

The next few days Edward and BoCo were hard at work making sure that the new harbour was finished in time for the opening. The two engines bustled around day and night until finally it was finished.

Henry was bringing a train of passengers for the opening of the harbour. He arrived a couple of minutes early.

"Why is that diesel still here?" he glared at BoCo.

"I want to see the opening," said BoCo, "and besides, this is my home now. I wouldn't want to leave for the world."

The passengers scattered from Henry's coaches to commence the opening ceremony.

"I now declare this new harbour open," announced the Fat Controller, "Special thanks go to Edward and BoCo, two really useful engines."

Henry rolled his eyes exasperatedly.

"If it weren't for Edward and BoCo this harbour wouldn't have been built, so three cheers for Edward and BoCo."

Henry felt sick.

"Thank you, sir," said Edward and BoCo respectfully.

Photographers came and took pictures of them.

Henry watched, he was beginning to feel a little jealous. A sudden rush of concern came over him as he began to worry that this might make the Fat Controller decide to replace all of his steam engines with diesels.

Edward and BoCo smiled for the cameras and children were allowed to ride in their cabs. They went a short distance up and down the line. The crowds loved it. Edward and BoCo enjoyed it too.

"I'd also like to thank Henry for bringing you all here. He is one of the best engines on my railway," said the Fat Controller.

The crowd then began to cheer for Henry. This made him feel more happy. He smiled as photos were now being taken of him and his coaches. He realised that the Fat Controller would never get rid of him.

"I'm sorry," he whispered to BoCo.

"It's alright," said BoCo, "Edward told me about what happened before I arrived."

"That's no excuse," said Henry. "I should have realised not all diesels are the same."

Edward listened, satisfied that his two friends were now getting along.

The visitors stayed all night. A journalist came and asked the engines questions for a local newspaper. Eventually, they all left and it was time for the engines to go home too. The three set off together to return to Tidmouth Sheds. Henry realised that BoCo was nothing like Diesel at all.

"That was a nice day, wasn't it?" said BoCo, "It's good to be appreciated for hard work."

The three engines went soundly to sleep.

The next day the engines went to work again. It was Henry's turn to pull the express and BoCo fetched his coaches for him. Henry doesn't think all diesels are up to no good anymore because he knows that some of them can be really useful. Henry even told Edward how much he liked BoCo when they were both waiting at the station. A week later James and Gordon were making rude comments about diesels and Henry told them to shut up.