Diesel 10's cab was a little cramped because he had to carry Sailor John, P.T. Boomer, Baz, Bernie, and Conrad, along with his driver… so it was a little cramped for elbow room.
But they were polite enough to move to the back for his driver to have some room, but there were some complaints about being unable to move freely.
Luckily, since Diesel 10 was a large diesel for his size, Diesel 10 could carry more than Diesel could since he was much smaller and was following him from behind.
"Where are we going, 10?" Diesel asked.
"I don't know," Diesel 10 responded. "But I think Boomer here has a plan."
Diesel cocked an eyebrow before continuing to follow Diesel 10 from behind, going down the line and heading towards Culdee Railway.
"What are we doing here, Boomer?" Diesel 10 asked, glancing up at his cab window over his face to see where they were.
"Well," P.T. Boomer spoke. "I saw her climb Devil's Back after that gigantic beast disappeared."
Diesel perked up after hearing 'gigantic beast' and slowed down a little, asking with a little stammer, "Wh-What gigantic beast?"
"Yeah, what's that?" Diesel 10 asked.
"It was a huge monster," P.T. Boomer explained as Bernie instantly hugged Baz's midsection as he listened. "It was like lab experimentation between a ram, a bird, a deer, and a rat gone wrong with millions of arrows stuck in its body."
Diesel gulped nervously as Diesel 10 asked, "Are there more of those things?"
"No, not really," P.T. Boomer responded. "…Best to be careful, though. I could be wrong."
Diesel 10 nodded and slowed down a little at Diesel's speed, not wanting to speed down the line as he glanced around while Pinchy was alert.
They soon arrived at the Culdee Railway, and Diesel 10's driver stopped, along with Diesel's driver, and some of the people looked confused.
"Why did we stop?" Bernie asked.
"Because Diesel or I can't be on the rails because they are too small for us," Diesel 10 explained. "So this means that you guys need to follow Boomer."
Sailor John was silently grimacing as he looked at the height of Devil's Back, feeling his arthritis already hurting at the sight of the gigantic mountain.
"Well, let's search before any of them appear." P.T. Boomer nodded.
So they stepped out of Diesel 10's cab and started climbing Devil's Back, alert and searching for clues about what that blue-haired girl was doing.
P.T. Boomer was running after that beast when it appeared and hid from it, but he saw Sir Topham Hatt and Stephanie appear before it started chasing after them.
He did not move from where he was hiding until the beast disappeared, and the same blue-haired girl with pointed ears reappeared before heading up Devil's Back.
Since then, the blue-haired girl sort of disappeared, and P.T. Boomer shrugged it off until Baz and Bernie brought it up and got kidnapped by Diesel 10.
And now he is once again roped into having to dive into the rabbit hole of helping Diesel 10 'defeat' someone who is causing this trouble.
The last thing P.T. Boomer wanted to do was get himself so far into 'researching' that he would have to bring up some terrible memories he never wanted to remember.
"Hey, Boomer!" P.T. snapped out of his thoughts and glanced over, seeing Baz leaning against the mountain, Sailor John wincing as he had his hands on his back, and Bernie huffing and puffing along with Conrad. "Slow down a little, will you?"
"Sorry!" P.T. Boomer called. "Just hurry, will you? I-"
He paused when he saw something from the corner of his eyes, drawing his attention away from the slowpokes and over to the mountain's wall.
It looked like scratches in the mountain's wall, which were not supposed to be there, right?
P.T. Boomer walked over to the mountain's wall and inspected the markings, wiping his hand across the wall and removing some debris.
He saw a bird-like symbol as it was carved in the art style of Native Americans.
He moved more of the debris as it showed a rat symbol carved in the art style of Chinese, a ram symbol in Greek, and a deer symbol in Celtic, confusing P.T. Boomer more after seeing the signs.
Where has he seen these symbols before?
P.T. Boomer reached into his bag and took out a book, looking at the covers before rummaging through it to look at them.
He swore he had brought it with him unless he could have-ah!
P.T. Boomer soon took a mythological book from his bag and opened it, flipping through the pages before stopping at a page about 'Chinese Zodiacs.'
The rat symbol matches the one on the mountain's wall, which means that one part of it belongs to the Chinese Zodiacs.
The others soon caught up with P.T. Boomer as Bernie said, panting, "For someone older… you sure walk faster than us."
"Shh, Bernie," Baz shushed. "He's working on something."
P.T. Boomer glanced at them with a slight glare before returning to what he was doing, flipping through the pages to another chapter of Western Zodiacs, seeing the ram symbol is 'Aries.'
…Then what are the bird and deer symbols?
He went through some book pages with bird symbols, but none of the symbols matched the ones on the wall.
P.T. Boomer was halfway through the book when he finally came across the page of 'Native American Zodiacs,' seeing the bird symbol resemble the Falcon Zodiac.
Even a page about Celtic Zodiacs, where the deer symbol belongs to the Celtic Stag Zodiac, is the same.
…So the symbols on the rock wall are Zodiacs?
P.T. Boomer closed his book and placed it back into his bag before wiping more of the debris, seeing something in the middle of all three symbols in a circle.
It looked like a symbol of a keyhole, but it was cracked as its age returned after being still for a million years.
"I think we found out what she did," P.T. Boomer said, pointing to the symbols.
The others looked as Bernie asked, "What are the symbols?"
"Zodiacs," P.T. Boomer responded. "It looks like the one chasing that blue-haired girl was a mashup of these four Zodiacs."
Sailor John and Baz looked at the symbols as Sailor John noticed the cracked keyhole before attempting to push against the wall, thinking it was a door.
"But what did she unlock?" Bernie asked.
That question stumped P.T. Boomer after Bernie asked, but he felt it was not any of the bigger Zodiacs chasing after her.
Sailor John stopped attempting to open the 'door,' seeing that it was permanently closed and no key was around to unlock it.
"I think there's another one around," P.T. Boomer told the group. "There are the Taurus Zodiac, the Chinese Ox Zodiac, the Cat Zodiac, and the Beaver Zodiac. So we could find that one and see what is behind it."
"Good idea," Baz nodded. "But where could this door be?"
"In the woods?" Sailor John shrugged. "Beavers are usually around a lake wit' a bunch o' trees."
"Then let's start looking through the forest then," P.T. Boomer mentioned as he started to go down the hill.
"Great!" Sailor John groaned as Conrad leaned against the rock. "More walkin'."
P.T. Boomer ignored him as they walked back down Devil's Back, this time a little slow for the others to catch up as they followed behind.
Once they reached Diesel and Diesel 10, they explained what they had discovered, and both diesels looked curious.
"So going into a forest would help to find another one?" Diesel 10 asked.
"Exactly," nodded P.T. Boomer. "It's best to find it before that blue-haired girl does."
Diesel 10 nodded as his driver opened his cab to allow them to enter before leaving with Diesel behind him.
But as they descended the line, something semi-invisible watched them go down the line before disappearing into thin air.
Meanwhile, Diesel 10 and Diesel stopped for a minute to refill their tanks with oil and continued their adventure, entering the forest and looking at each creek and tree.
None of them had that distinctive appearance that said, 'Hey, come over here! We're a door!' Instead, it was slowly grinding Diesel 10's patience down.
They soon came across another creek with a large tree, but there was no sign, and Diesel 10 stopped with Diesel behind him.
The others stepped out of Diesel 10's cab as Diesel moaned, "Face it, this isn't the door. I think we shou-"
But he watched P.T. Boomer walk away as some followed him, sighing as he just watched them.
P.T. Boomer approached the tree and inspected it, removing the moss and items from it, seeing the two oxen and the single beaver and cat underneath them.
"We finally found it!" Baz called Diesel 10 and Diesel.
"Really?" Diesel 10 perked. "That's the door?"
"Yes," Bernie nodded.
"Alright," Diesel 10 smirked as Pinchy lifted, clacking together with excitement. "Move so I can-"
A loud moo-like roar echoed through the forest and shook everyone, causing them to glance away from what they were doing and look around.
"Was that the farmer's prized bull?" Diesel asked.
"Sounds a little too loud to be-," Diesel 10 said, but stopped when something massive appeared, instantly turning his face from confusion to 'oh crap' along with Diesel.
Standing just a few meters away from the human group, there was a gigantic Minotaur, but its legs were missing, and it only had its arms that were keeping its body upright.
It had a large pair of horns protruding from its head, buck teeth with a beaver-like tail that was narrow at the top and flattened at the end, and a collar with a pendant.
That's no prized bull.