Main Scenario/More Haste, Less Speed

Ruins of Thunder Episode
27-1	Song of Doom
27-2	Joint Operations
27-3	A Strong Tribe?
27-4	Intuition of the Shana Tribe
27-5	Ruins of Thunder
27-6	Mysterious Sealed Wall
27-7	Part of the Railway
27-8	A Small Handprint
27-9	Princess of Thunder
27-10	Mission Accomplished

Which we stopped at the the Ruins of Thunder along the Metro Hole. During our investigation, we found what looked like a hole leading further into the ruins.
The small Versailles rappelled down into the hole to see what was inside, but an unknown being pulled her downwards so hard that all those supporting the rope almost fell to the bottom of the hole.
Versailles	"Queensway, let go of the rope! If you don't, we'll all fall in!"
Queensway	"What are you talking about! We would never do that! We're all going up together, we'll be fine! Don't give up!"
Versailles	"It's the Mist! The hole is full of Phantom Mist! This is a trap! You mustn't all come here!"
--The hole beneath is full of Phantom Mist.
Versailles shouted at Queensway to cut the rope, but Queensway, who was supporting Versailles up close, could not do as Versailles said.
However, Euston did just that. Without hesitation, she cut Versailles' rope and let Versailles drop down the hole.
Finchley	"Paddington, what's the status of the Mist Train?"
Paddington	"A-OK! We're ready to go at a moment's notice!"
Euston	"The rail brakes that previously brought the train to a sudden stop also doesn't seem to be working now. The train should be able to operate as normal."
Finchley	"Good. Now it's just a question of where to proceed."
Finchley	"Brittany, how about the route through the site?"
Brittany	"Yes, sir. I've just finished checking the route to the chamber. Here is a map of the routes within the Ruins of Thunder."
Finchley	"A route map of the Ruins? How did you manage to produce such a thing in such a short time?"
Brittany	"It's thanks to Paddington's memory. I was able to single out only the railway lines into one map from all the different maps she made for the way there and the way back."
Euston	"Miss Brittany, can we get to where Versailles is by train?"
Brittany	"Frankly speaking, I cannot say for sure at this stage whether the railway line continues to Versailles."
Brittany	"But I think it is possible to travel by Mist Train to that chamber where we were. All the barriers that were activated as traps have been lifted, so as long as the path is not blocked again, we should be fine."
Euston	"The ruins with the disarmed traps are part of a railway line. It seems more likely that the whole site is covered by the railway line."
Brittany	"Oui, I think so too. I don't know how far it goes, but it would at least be possible to go beyond those halls."
Euston	"Versailles probably entered the lower levels of the ruins. There must be a tunnel that goes further down from the Celestial Sphere Chamber..."
Brittany	"Go to that chamber again and we'll see. There may be doors that open in response to the train's magic."
Queensway	"Sir Conductor, Instructor Finchley. Everyone is ready. Ready on your command."
Finchley	"Conductor, please use your judgement. If we follow the route map, I think we can make it."
Conductor	"I trust Brittany's route map. Let's continue as planned by train to the Celestial Sphere Chamber.
Conductor	We will be very careful to avoid contact and derailment accidents as we proceed through the ruins. Proceed with low speeds, and Train Knights should prepare to engage for combat outside the train.
Finchley	"Roger that."
Finchley	"All hands in position! We will now re-enter the interiors of the Ruins of Thunder by Mist Train!"
Queensway	"Roger that!"
Putra	"Alright! We're going in again! We have to save Versailles as soon as possible!"
Vivienne	"Oui. Versailles will live. I'm sure she's waiting for us."
Brittany	"I'll take the lead with Paddington. We have to make sure there are no changes to the structure of the ruins."
Queensway	"Miss Yakutsk, Miss Yoshino. Please make the final checks. If everything is OK, we will depart."
Yakutsk	"Hold it, Yoshino has some concerns..."
Queensway	"Concerns?"
Yoshino	"Yakky-tan. That's a nosh. Rephrase that."
Yakutsk	"?"
Yoshino	"Change it to 'be waiting a minute' instead of 'be a bit concerned'."
Yoshino	"Yoshino has just passed the level of 'there are concerns'. Thinks we should wait a little longer before leaving with the Mist Train."
Queensway	"Eh-!?"
Finchley	"What's wrong? Is there a problem?"
Queensway	"Miss Yoshino wants the train to leave a little later."
Euston	"Why? There's nothing wrong with the train or the ruins. I don't think we should stay here for too long."
Yoshino	"The problem is where we are. The rails at this station are a little bit dubious. Suggest to go forward or backward only a bit and see what happens."
Euston	"Right, I recalled Miss Yoshino said we're on magic rails. I heard that it was imbued with a magic power that automatically slows it down..."
Yoshino	"Yes. It's rails that affects the wheels of the train."
Yoshino	"The rails are starting to have a little bit of magic in them again. It's increasing in intensity. You should check it out, Euston will understand."
Euston	"......"
Euston	"...For sure."
Yoshino	"Glad you understand."
Euston	"It's different from the magic I can feel in the Mist, and from the magic that people manipulate. Is it a unique power possessed by ancient ruins?"
Yakutsk	"But it is strong enough to override Conductor's magic? I doubt it would have much effect on preventing movement. It's not like a mousetrap that sticks to the wheels and won't let go."
Yoshino	"Not sure if it can control Shashou's magic power. But if Shashou injects magic into it, it might react."
Finchley	"The risk is too high. We should fall back and see what happens, as Yoshino suggested."
Finchley	"Euston, you know the saying, 'More haste, less speed'?"
Euston	"Yes. The priority is the Mist Train and Sir Conductor. We can't afford to have anything happen in the middle of a tunnel like this."
Finchley	"Paddington, reverse slightly. Turn back to where the Mist Train started slowing down."
Paddington	"Aye, sir! Mist Train, slight reverse!"
Paddington	"......"
Paddington	"Hawawa?"
Finchley	"What's the matter?"
Paddington	'No, it just might be my imagination. Here, this and, that way..."
Paddington	"Huh? I'm not imaginating things after all?"
Finchley	"What are you messing about with? Any trouble?"
Paddington	"No, it's not really a trouble..."
Paddington	"......"
Paddington	"The Mist Train, is inoperable!"
Finchley	"IDIOT! THAT'S CALLED TROUBLE!"
Vivienne	"Paddington, hold up! What are you doing? The rails and wheels are glowing red. I thought we were supposed to go backwards."
Paddington	"The rails are glowing red!? But all I did was operating normally!?"
Vivienne	"You operating the train normally is, by all accounts, an anomaly."
Putra	"Yoshino, can you do anything about this?"
Yoshino	"Can't do anything about this, that's why Yoshino asked for a 'be waiting a minute'."
Putra	"Do something! Show off your inner Kougyoukei or something!"
Yoshino	"This is no longer within the scope of a kougyoukei. It's in the hands of a mahou shoujo-kei now."
Vivienne	"The energy is filling up fast. Is this also because of those weird rails?"
Yoshino	"The deceleration rails are transforming into acceleration rails. If this continues, the Mist Train will be doing..."
Putra	"The Mist Train will be doing...?"
Yoshino	"Maximum full-power acceleration!"
Putra	"Maximum full-power acceleration!?"
Putra	"What...? That's like saying it's seafood from the sea."
Yoshino	"Maa, something like that."
Finchley	"All hands prepare for rapid acceleration! We're charging straight inside the ruins!"
Queensway	"The train's furnace isn't even reacting that strongly. The same as when we broke through inside the Giant Tree..."
Yoshino	"The only difference is that Paddington's normal this time."
Paddington	"Hawawa, we're going to move forward at full speed, reluctantly~!"
The magical train, the Mist Train, had lost control due to the power of the acceleration rails from the halt inside the Metro Hole.
Ran at a speed that was clearly too fast to proceed through the intricate interiors of the Ruins of Thunder, it started running deeper into it...

Ruins of Thunder Episode
28-1	More Haste, Less Speed
28-2	Vivienne's Anomaly
28-3	Guardian of the Otherworld Portal
28-4	Dark Power
28-5	Administrator of the Ruins
28-6	Teleportation Magic
28-7	Knight Commander and Instructor
28-8	Apostle of Doom
28-9	Fairy King of Brocéliande
28-10	The Final Key