Through this function, the train can become larger, for example, expanding the carriage to 10 meters wide, 30 meters long, and higher in height, a giant mega-train!

"..."

Chen Mang narrowed his eyes slightly, especially considering the second function, which he felt was very necessary. Accompanied by the train's upgrade, the future accessories will become increasingly larger, and the train's small size makes it impossible to embed some large firepower accessories.

But a larger train also has its drawbacks.

It cannot enter some terrain-limited areas.

The iron ore required for expansion isn't much, so he had to consider it. First, go to the blue zone to see how others do it, and inquire about some information from the Train Radio.

Moreover, upgrading to a Level 10 train involves more changes, which can only be known after arriving in the blue zone.

So next—

Set off!

"Woo!!"

With the sound of the whistle, the Fixed Star train gradually accelerated, speeding to the northernmost part of the Zombie Basin, the destination being the blue zone intersecting with the Zombie Basin, "Crisis Valley."

And the Traveling Frog followed closely behind.

One after the other.

Speeding across the wasteland, every zombie in the way was instantly turned into blood, merging into the heavens and earth.

...

Over an hour later.

The Fixed Star train arrived next to an abandoned village.

This village is where Zhang Yiren was found.

Inside a house in this village, there was a very small Level 3 mine, and after fully exploiting this mine, one would enter the Adventure Map "Eternal Prison." Last time, Er Dan entered this Adventure Map and failed, receiving a curse.

He glanced at a Special Tool in the drawer.

-

"Special Tool": Dungeon Access Card.

"Item Effect": When in the 'Eternal Prison' Adventure Map, you can use this card to open the door of a dungeon within the map.

-

This tool can only be used within the Adventure Map.

This Adventure Map probably doesn't exist in other areas.

He wasn't sure if the mine has refreshed. This mine is special, the "Resource Detection Radar" cannot detect it, and he doesn't know the exact refresh time. He came over to try his luck; if it refreshed, then he could venture into this Adventure Map.

If it hasn't refreshed, then so be it.

Who knows when it will refresh? Can't just wait here, wasting progress.

At this moment—

Biaozi's voice came from the train room's speaker: "Master Mang, there's a mine here!"

"..."

Chen Mang suddenly laughed, realizing that everything had been going so smoothly lately that he felt a bit uneasy, wondering if he was overextending his future luck. A major disaster might be waiting for him when he reached the blue zone.

He immediately picked up the walkie-talkie: "Get to work!"

Since this Level 3 iron mine has already refreshed.

All that was needed was to exploit this iron mine fully, then enter this Adventure Map.

Although there are many residents on his train, the mine is small, unable to accommodate many residents, and it will take at least more than an hour to finish mining, so he patiently waited a while.

This Adventure Map, Er Dan had already been there once and couldn't go again.

He picked up the walkie-talkie from the Train Radio.

"Er Dan, explain carefully what's in this Adventure Map."

"Okay."

...

On the other side—

On the "Shahe Plain," an invisible pressure and panic enveloped all the trains, becoming a looming shadow over many Train Captains.

This situation has a long story.

More than ten days ago.

Three Level 6 Train Captains agreed to go together to the yellow zone "Zombie Basin" and to support and help each other in the future. Such things are common because more people mean more strength, provided they find trustworthy allies.

The result...

When the three trains confidently crossed the Kunlun Mountain region, ready to enter the Zombie Basin, they witnessed an incredible scene.

Only to see in the Zombie Basin area.

An endless tide of corpses was fiercely attacking the trains at the mountain's edge in the Zombie Basin. They even saw a village filled with Level 9 zombies!

Countless monsters were flying in the sky.

Even from underground, high-level worm monsters occasionally drilled out.

At a glance.

Everywhere was filled with all kinds of zombies and monsters, the strong stench of corpses and blood covered the intersection of the Kunlun Mountain region and Zombie Basin area, surrounded by the sounds of gunfire, monster roars, and desperate screams before death.

Occasionally, explosions of flames erupted.

Those were instances of trains Self-Destructing!

This scene terrified them, and after a moment of daze in the train room, the three trains hurriedly returned the way they came, going back to the Shahe Plain. At that moment, they were grateful they hadn't entered the Zombie Basin prematurely.

Otherwise, they might have met a tragic end.

After these news reached the Shahe Plain.

Many Train Captains fell into silence. It's clear that such a "Zombie Basin" situation is unenterable, yet the Zombie Basin is their only accessible yellow zone, implying they would be completely locked in the Shahe Plain.

Some trains accepted this fact; being a king on the Shahe Plain isn't bad either.

However, more Train Captains were unwilling to accept it.

Nobody knows what the future holds after Doomsday; the stronger the train, the higher their chance of survival!

No matter how Train Captains digested this news, it was undeniable there was no solution.

Moreover—

If in a certain region trains only enter and never leave, soon this region would become overcrowded, and fights for iron mines would become more frequent, unlike the usual practice of leaving if another train occupied a mine, to find another.

"Master Mang should be alright, shouldn't he?"

Inside the "King of Electronic Music" train, a dwarfish man somewhat blankly looked towards the horizon. Recently, he had heard about the changes in the "Zombie Basin." The Fixed Star was in the Zombie Basin area, and during the last meeting in Neon City, it was said that the Fixed Star had advanced to a Level 7 train.

Who knows if a Level 7 train could withstand this crisis with so many Level 9 monsters.

It feels tough, but since Master Mang claimed to have the ability to destroy a Level 8 train with a Level 7 train, perhaps there is not a small chance of survival, as long as he doesn't encounter Level 9 monsters.

Who knows if there will ever be another chance to see Master Mang again.

...

At this moment, inside the village of the Zombie Basin.

The Level 3 iron mine had been successfully mined, it's a tiny mine.

Subsequently, a Teleportation Gate appeared in front of the train, and then a strong suction force emitted from it, the Fixed Star train immediately plunged into the Teleportation Gate in front.

As the vision continuously changed.

The surrounding scenes emerged quickly.

Once everything settled down.

The Fixed Star train was already inside a massive prison, one capable of holding a train. The surrounding walls were made of mud, the lighting was dim, with only oil lamps hanging on either side of the corridor outside the cell.

In front of the cell was a huge iron bar.

This was the Adventure Map, and the scene in front was exactly as Er Dan described.

"..."

Chen Mang calmly glanced around quickly. All Adventure Maps were real locations, not fictional, and most were once part of the "Mechanical Civilization," which implies that the Mechanical Civilization indeed built a prison for imprisoning trains.

Judging by the dungeon's area.

It could easily detain a train with 30 carriages, even larger ones, without issue.

On the screen in front of the train, the Adventure Map's information appeared.

-

"Long, long ago, some trains that erred would be imprisoned here to reflect on their wrongdoings."

"But..."

"One day, a train freshly incarcerated in the dungeon discovered a way to escape, successfully fleeing the Train Dungeon, which led to great calamity."

"The Mechanical Civilization never knew how that train managed to escape."

"Perhaps you will discover the truth."

"Escape within 24 hours to pass."

"Exceed the time limit and you will receive a random curse."

-

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