Then he turned his attention to the components that could be crafted once the train was upgraded to Level 10.

There were three in total.

-

"Star Ring Energy Shield": Red-grade component, requires 50,000 units of iron ore to craft.

"Comet Main Cannon": Red-grade component, requires 50,000 units of iron ore to craft.

"Hellfire Wheel": Red-grade component, requires 50,000 units of iron ore to craft.

-

Three red-grade components!

These three components are the core of the train upgraded to Level 10. The battle capabilities of a train equipped with these three components compared to one without them are worlds apart!

The grades of vehicle accessories, from low to high, are as follows:

White, Green, Yellow, Blue, Purple, Red, Gold, Pink, Seven-color.

Above Purple is Red.

Purple-grade components can only be upgraded to Level 10 at most, with two Supermodel Effects.

Red-grade components can reach up to Level 20, with three Supermodel Effects.

But this involves a resource issue.

It's equivalent to spending a huge cost to craft the "Wealthy Energy Shield," which is now useless, requiring resources to re-upgrade the "Star Ring Energy Shield," wasting a large amount of resources. This is why some trains put all their resources into train upgrades, without upgrading the energy shield at all.

As long as there's no danger.

The best way to conserve resources is to upgrade directly to Level 10 in one go, then upgrade the "Star Ring Energy Shield."

Of course, the premise is surviving up to Level 10.

And the "Comet Main Cannon" demands a certain size for the carriage, with a caliber of 2 meters and a base width of 5 meters, it's a giant energy cannon typically embedded at the front of the train, requiring a train front width of at least 7 meters.

Without the train expansion gained from upgrading to Level 10, it would be impossible to craft this main cannon.

"..."

Chen Mang contemplated silently, realizing the Fixed Star Train also needs expansion. As the train upgrades, it's bound to get bigger; powerful weapons have large sizes, so a too-small train can't accommodate them.

Even if forcefully mounted.

It looks awkward, like a mule pulling a large cart.

Though many places would become inaccessible with a larger train, the ground units would need to execute tasks in such circumstances.

He hasn't crafted any of these three components yet; they are too expensive to produce for the time being.

And the...

"Flaming Wheel," similar to the Wind-Fire Wheel, is designed for operation on hard surfaces like wastelands, offering extreme speed, but is a higher-end substitute for the Wind-Fire Wheel, faster and pricier.

This concludes all information about this area and the Level 10 train.

It's fair to say.

After upgrading to a Level 10 train, it genuinely feels like owning a Doomsday Train, unlocking many components and functions that previously felt like part of a Newbie Village.

Each level thereafter marks a qualitative leap in combat power.

...

12 hours later,

The dawn has come.

This 3-level iron mine deep underground was completely extracted, replenishing the train with 2.8 million units of iron ore.

All residents returned to their respective positions in the carriages to rest.

While the Fixed Star Train swiftly traversed underground, searching for potential iron ore on the surface and underground. This region underground had no monsters, at least none witnessed in the 12 hours spent there, nor were other trains seen, as if no one had the Drill component.

The speed of underground navigation was fast enough, not much slower than on the surface.

Priority was to upgrade the armor.

At least upgrading it to Level 11 first, and then adjust the carriages, as the number of residents is extensive, needing rapid relocation into the Resident Gate, followed by a substantial upgrade of all the basic components.

Chen Mang navigated the train, delving deep underground.

Since the "Zombie Basin" incident, upon entering a new area, the first action now is to scout underground for hidden treasures, drilling as deeply as possible.

In the next moment—

When digging 10,000 meters deep underground, the Target Detection Radar began sounding off.

Indicating at a depth of 30,000 meters underground.

There exists a... Train Tunnel?

Similar to the Supersonic Train Tunnel on the regional map of the "Earth Core Nuclear Bomb" area, but deeper underground parallel to the surface, the tunnel is immense with height and width around 100 meters each.

Such a large space, let alone a train passing through, even the largest Zombie sighted, the "Level 7 Mechanical Zombie King," could traverse easily.

"Is something indeed hidden?"

Chen Mang's expression turned a bit odd, immediately maneuvering the train for further descent, to investigate this tunnel's situation, generally unreachable by standard trains.

Due to low-level drills, the speed in underground travel is sluggish, taking ages to reach such depth, and owing to radar range lesser than his, none of the high-grade substitute parts for the Target Detection Radar were visible, naturally, fully upgraded radar had a detection range of merely 3,000 meters.

The train dove deeper.

The drill hit the tunnel exterior made of reinforced concrete, exceptionally sturdy, difficult to penetrate, even his Level 50 drill struggled, yielding mere powder, incapable of major impacts.

But he wasn't discouraged.

After expending 377,500 units of iron ore, he directly upgraded the drill to Level 100!

The drill became sturdier, rotating faster.

Significantly improved compared to before.

Once the Level 100 drill began rapid rotation, enormous amounts of powder scattered, quickly forming a small opening on the tunnel's exterior, soon carving a large hole for the train to enter the tunnel below seamlessly.

The Fixed Star Train hovered mid-tunnel, all 15 carriages gently landing on the ground.

The tunnel had four spaced-out lanes, commonly termed as four lanes, each notably wide, accommodating large vehicles.

The air inside the tunnel was quite stifling, virtually devoid of oxygen.

Ever-present incandescent lamps lined both tunnel walls, preventing the tunnel from seeming overly dim; neither the start nor end of this train tunnel was visible.

"This tunnel presumably wasn't here before the doomsday, right?"

Chen Mang seated inside the train chamber glanced around, "So this train tunnel presumably forms part of the Mechanical City within the Red Zone's ruins?"

"Consider it a secret passageway of the Mechanical City."

"Even without Bunny Cloud Wheels, one could enter the Mechanical City ruins smoothly?"

"If that's the case..."

He glanced at the control panel's direction indicator, "Driving north should lead me to the Mechanical City ruins, yet it's unclear where this train tunnel begins?"

"..."

After pondering for a while, he reversed the train in the tunnel, heading southward along the "Train Tunnel."

His curiosity towards the Mechanical City wasn't much; many have visited, and he isn't convinced he'd find valuable items there.

However, this train tunnel likely hasn't been traversed for a long time; it's coated with thick dust. His curiosity piqued regarding this tunnel's connection to the Mechanical City!

Such a place surely hasn't been explored.

Uncharted spots indicate prospects for better gains!

...

Inside the train tunnel.

The Fixed Star Train, adhering strictly to traffic rules, traveled on the rightmost lane of the four lanes, with smaller side roads on both sides featuring signs advising smaller trains not to occupy the lanes for larger trains.

While knowing enforcement ceased long ago.

He strictly adhered nonetheless.

This eerie place could suddenly spring forth a Level 12 robotic traffic cop from the Mechanical Civilization, potentially intercepting his train for infractions, an understandable scenario.

The train was not at top speed.

Speed was maintained at 280km/h; anymore would obscure potential hidden hints within the tunnel's edges. Some information evades AI detection, discernable only through human cognition.

AI's assessment of details resembles spot-the-difference, lacking depth in associative thinking.

While humans can deduce simple sketches from leaf veins, transcending to curves, feminine forms, cigars after intimacy, achieving sage-like state.

AI merely correlates a leaf with botany.

Thus not of the same caliber.

This explains why AI cannot reflect on truths from an apple.

At that instant—

"Ah?"

Chen Mang, observing the scene ahead, was slightly taken aback, "The enforcement is that blunt?"

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