"Solar Energy Panels."

This was bought from the "Mechanical Train Accessories Store" in Neon City at that time, with quite a hefty price tag.

Blue-grade accessory.

He consumed 110,000 units of iron ore to upgrade it to Level 10 at that time.

And obtained two supermodel effects.

1: Energy can be harvested at a slower speed even at night.

2: Overflowing energy will be converted into Energy Stone.

This accessory can cover a significant portion of his daily accessory consumption, roughly equivalent to 8,000 units of iron ore per day.

Immediately consumed 4.5 million units of iron ore to upgrade this accessory to Level 100 in one go.

Due to it being a blue accessory, the resources consumed were a bit more.

At Levels 20, 50, and 100, the supermodel effects were none.

However...

This isn't important; what's important is the daily iron ore yield has reached 200,000 units, which is enough to cover the daily operation of train accessories, with an additional 180,000 units of iron ore every day.

It would take 25 days to break even, and after 25 days, it's pure profit.

Not bad.

With the "Cosmic Receiver," the train currently makes a passive income of 660,000 units of iron ore a day without doing anything.

Although it doesn't sound like much, it's passive income, which provides enough security in many situations.

Before Doomsday, many people were obsessed with creating sleep-income. Isn't it because work is something you only get paid for when you do it; but with sleep-income, even if you do nothing, you still get paid.

Chen Mang glanced at the train unit panel.

There are still 3.2 million units of iron ore.

It's about as far as it goes.

Let's not spend it for now.

The three Level 4 iron ore deposits in the train tunnel directly brought the Constant Star Train to a pinnacle of opportunity. Next, he had to continue mining, then check in the Mechanical City for any antidotes.

Where there are Seven-step Snakes, there must be antidotes within five steps!

He didn't believe he was the only one facing the trade-off between "Drill" and "Train Expansion"; other trains would surely face this issue, and since this problem only exists in the Blue Zone, he felt the Blue Zone should have corresponding antidotes.

...

Soon—

Half a day flashed by.

The iron ore was completely mined, Er Dan's adventure task was successfully completed, and it was time to part ways, with rewards content received.

-

S-level difficulty reward: Special Tool "Size at Will Drill Order."

-

"..."

Chen Mang looked expressionlessly at the special tool in his hand, which resembled a gyroscope. The only effect of this special tool is to allow the "Drill" accessory to change size at will.

Maximum cannot exceed the train's cross-section.

Minimum cannot be less than one centimeter.

It's a low-grade version of size at will.

He felt he might have thought too much; he believed there must be antidotes within seven steps and had to run to find them in the Red Zone's Mechanical City ruins, but unexpectedly the antidote was in the White Zone.

It really was within seven steps.

With this special tool, the "Drill" can perfectly combine with "Train Expansion."

"Uh..."

Er Dan hesitated: "Master Mang, is this tool useful for you? Seems like the reward is a bit crappy..."

He didn't plan on train expansion; he focused on flexibility and speed, even with only a few cannons as weapons; it was enough since he wasn't planning to engage in combat...

His task is more like running.

Mainly focusing on speed.

"Very useful."

Chen Mang sighed lightly before tucking the small gyroscope into his chest and patting Er Dan's shoulder: "Go on, today you and I investigate the adventure map of Crisis Valley; tomorrow, you will soar the star-sea with me."

"Believe in your talent and fortune."

"You're a born adventurer."

Er Dan didn't speak, just nodded firmly and heavily before striding towards his "Traveling Frog" train room. Soon the train head soared in the air, shooting towards the distance!

Watching Er Dan going far away.

Only then did Chen Mang return to the train room and place the tool on the console. Soon the tool scattered into countless light spots and disappeared in the air, completely merging with the console, and a line of information appeared on the console screen.

-

"The Constant Star Train loaded the 'Size at Will Drill Order'; henceforth, the white accessory drill can change size at will."

-

This is now perfect.

Then he looked at train expansion; the specific extension size is up to him, with a maximum limit of 100 meters wide, 300 meters long, and 100 meters high per carriage.

"..."

Chen Mang imagined the scene in his mind, 100 meters high, equivalent to a 30-story residential building. Each carriage at this level is no longer called a train.

Call it a land ship.

Perhaps it might not seem out of place in the universe, but on land, it's overly conspicuous.

Such a large train, speed will certainly decrease significantly, energy consumption would also increase a lot, and many places would be impossible to go, like the "Train Tunnel," although most of the adventure maps he visited were considered for train driving.

Like the "Train Tunnel," the height alone is nearly 100 meters.

But it's just nearly 100 meters, completely unable to accommodate such a size train running through.

When he pulled the train expansion to the max, the required consumption units of iron ore popped out.

"140 million."

"What an unfamiliar unit..."

Chen Mang silently adjusted the train expansion a bit to the left. It was the first time he saw the unit billion; why does it feel so unfamiliar, like when did iron ore start being measured in billions?

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