Toola Roola and Coconut Cream work at the quarry with the twin engines Bill and Ben.The twins can be cheeky.But,They are also really useful.One day,An argument started between the twins as Ben started pushing a line of China clay trucks.

“That’s my line of trucks!”Snapped Bill.

“Its not!”Scolded Ben.”Yours is what you’re pushing!”

“It’s mine!”Scolded Bill.

“It’s not!”Scolded Ben.

“It’s mine!”Scolded Bill.

“It’s not!”Scolded Ben.Toola Roola,Coconut Cream,And Boco were worried.Boco tried to stop the argument.

“Ok!Just take it easy or the only thing you’ll get is....”But,The twins didn’t listen as they bashed the two lines of trucks together and tumbled them off the track.“Trouble.”

“Silly!”Scolded Bill.

“Silly yourself!”Snapped Ben.Sir Tophom Hatt arrived.

“Now,Bill and Ben,Behave yourselves.”He said.“Also,I’m sending a diesel to help with the extra work.His name is Derek.”Bill and Ben now felt sorry for each other.Meanwhile,Sir Tophom Hatt was having his own problems.”I hope the now diesel doesn’t cause any trouble with his engine failures.”And he did when Derek was going up Gordon’s hill.

“Oh man.Why did there had to be a hill on the way.”Said Derek.Suddenly,There was a coughing noise from Derek's engine.“Oh!Whats that?”He wheels spun and his engine smoked.Boco came to the rescue.

“What happened?”He asked.

“Sorry.I’m not used to going up hills.”Said Derek.”I have teething troubles.”The news soon spread when Thomas and Twilight met Percy and a Spike at the docks.

“Apparently,It’s teething troubles.”Whispered Thomas.Percy and Spike left and told the fillies and twins at the quarry.

“Be careful.”Said Spike.”Cause this diesels got a toothache.”And he and Percy laughed as they left.

“What does that mean?”Bill asked.

“Because he knows we’ll meet it.”Said Ben.”A diesel with a toothache must be the worst diesel ever!”Then,The quarry manager spoke to them.

“You will deliver your China clay to the docks.Tomorrow,Derek will help.”It was dark when fillies and twins delivered their loads and went to sleep at the sheds.Duck and Trixie were already there.

“You four look glum.”Said Duck.

“It’s that Derek.”Said Toola Roola.

“He has a toothache.”Said Coconut Cream.

“He does not.”Laughed Duck.”Hes got teething troubles which means he’s new and sometimes causes some problems.In instance,It’s his poling system.”Next day whe the twins and fillies were ready to take the heavy train,They heard an unfamiliar horn.

“Here comes Derek.”Said Bill and it was when he arrived.

“No need fro problems.”Said Derek.”You take the front and I’ll push from behind.What fun.”All went well as they set off.When they started up the slope,There was trouble.Derek felt tired.

“Come on!Push harder!”Called Ben.But,Derek couldn’t push any harder.Then,There was trouble again.

“I’m overheating again!”Cried Derek as his engine smoked and stopped.The twins were furious!

“Well,I guess we need to pull the trucks and the diesel at the same time.”Said Toola Roola.

“An you do it,Twins?”Coconut Cream asked.

“We’ll try.”Whistled the twins as they pulled as hard as they could.At last,They arrived at the docks.Sir Tophom Hatt was very happy.

“Well done,You four.”He said.”I sent Derek to the diesel works.Can you handle the rest alone?”

“Yes,Sir.”Said the twins.

“Derek was kinda friendly.”Said Toola Roola.

“He sure is.”Replied Coconut Cream.

“You know what friends do?”Duck asked.

“What?”The twins asked.

“Say good night to each other.”Said Duck and they did before going to sleep.