As soon as there are many things, time flies very quickly.

Going back and forth between the factory, the school and the imperial court, the year has turned over in a blink of an eye.

Now, it is the beginning of the eleventh year of Zhenguan.

March.

Spring is coming, and everything is renewed.

Recently, the entire city of Chang'an has been plunged into a carnival.

The reason is simple –

The factory outside the city is too rich!

on the city walls.

Lu Heng and Li Shimin stood side by side, looking at the suburbs.

His Majesty Li Er pointed to the chimney that was emitting huge black smoke and asked slowly:

"Sunrise, I haven't been to your factory to see it in person, so there really won't be anything wrong with such a huge black smoke?"

His concern is security.

Factories need to make iron, and they consume huge amounts of iron and coal every day.

Li Shimin also heard from his subordinates that near the factory, most of the workers who came in and out in the winter before, and most of them were doing things shirtless, which was enough to imagine how hot it was!

With such a high temperature, it is normal to worry about fire safety in advance.

Lu Heng also understood his worries, so he explained with a smile:

"Father, don't worry, the factory is not far from the camp in the western suburbs, if something happens, Uncle Cheng will immediately bring soldiers and horses to help."

"Besides, the entire main body of the factory is made of bricks and mortar, and almost no wood is used, which is much safer than the wooden buildings in Chang'an City."

After listening to his explanation, Li Shimin was indeed relieved, but he was also interested in other aspects.

The main body is all made of brick and mortar?

That's too extravagant, isn't it?

You must know that it is not uncommon for walls and floors to be paved with bricks, but they are limited to a part of the houses of rich and noble families.

The bricks themselves need to be specially mined and transported, which is a huge expense, and the triple soil required to build the wall is even more expensive.

His Majesty Li Er's gaze once again unconsciously fell on the factory in the distance.

"How much money did you kid put into it?"

"What the fuck is this coal burning......

"It's almost as good as burning silver!"

Thinking that Lu Heng might have thrown countless amounts of money into this factory, Li Shimin felt that his heart was dripping blood.

If not.

He can use all this money to raise soldiers and horses!

His heartache was so obvious that even people like Lu Heng who couldn't see other people's faces felt it a thing or two.

In order to avoid having to explain this and that to His Majesty Li Er again, Lu Heng hurriedly diverted his attention.

"Father, look over there, do you see it?"

Lu Heng pointed to the very conspicuous thing next to the factory and said:

"The one that twists and turns is the railway that Erchen is preparing to lay to Tuyuhun."

"You said you wanted to see the real thing, but that's it!"

Although he knew that Lu Heng was gagging and didn't want to talk about how much money he spent, Li Shimin was successfully diverted.

He narrowed his eyes and looked into the distance.

After a while, I saw some clues.

"I can see it from here, and it must be huge."

"This railway, can really make a car travel thousands of miles a day, and it will fly from Chang'an to Tuyuhun in a few days?"

Lu Heng smiled and patted the city wall in front of him.

"If you don't believe me, how about we get closer and ride over there?"

Li Shimin has nothing to do.

"Let's go!"

………………

It didn't take long for Weng and his son-in-law to be escorted by the Hundred Horsemen to the perimeter of the factory.

When you look so close, the factory looks even bigger.

Li Shimin drove his horse slowly and approached the railway.

What caught my eye was a huge steel serpent that stretched all the way to the west!

Lu Heng turned over and dismounted and walked to the side of the railroad tracks, squatted down, and gently stroked the cold track.

"Father, what about this railway, you can't let the car run to Tuyuhun by yourself, that's what the steam engine has to do."

"But it's also huge."

"Without it, even with a steam engine, the wheels would sink into the ground when going over those very winding, bumpy roads."

"You know, the train itself is so heavy that ordinary roads can't afford it."

"Another reason is friction."

"The reason why it is made of iron is that it has been tempered to give it a smooth surface, and when a train made of iron travels on it, it can roll over without being too blocked."

"So, don't look at the cost, but the railroad is essential!"

Listening to it, Li Shimin was already attentive.

He looked down at the track in front of him, and he didn't think about how much it cost to make this thing out of iron.

Half a day.

His Majesty Li Er asked softly:

"This is called the railroad track...... How did you come up with the idea? ”

"With such a long railway, the distance between the two tracks seems to be the same."

"Don't talk about your train that you haven't made yet."

"Even if the carriage is adjusted to the same as this, I am afraid that it will still be able to run very fast!"

Lu Heng was a little surprised.

Because, before the invention of the steam engine in the West, the gang made the railroad tracks, and they used horses to pull the carts.

His Majesty Li Er's idea is very advanced.

But in fact, long before the Westerners made the track, there were sages in China who invented this thing!

He was stunned and shook his head with a smile:

"Father, have you forgotten something?"

"This so-called orbit has appeared as early as Qin Shi Huang's array."

"The so-called car is the same track, the same text, the track inside, isn't this it?"

"It's just that hundreds of years ago, the First Emperor used wooden rails, and I replaced them with railroad rails."

"Wooden rails are too easy to break, and they are nowhere near as smooth as railroad rails, so this thing is still easy to use."

Li Shimin was stunned.

That's right......

Hundreds of years ago, when the first emperor ruled the world, the same track book and the same text proposed by the car had already been laid on the ground!

But for some reason, this wooden track was only handed down in books, and it was not continued to be used by future generations.

I am familiar with history books, but I can't compare to Lu Heng, a stinky boy who writes badly!

Such a simple method has been applied by our ancestors for a long time, but it has only been re-improved until now!

His Majesty Li Er was heartbroken: "The Manchu Dynasty is civil and military, and there are hundreds of people in the Ministry of Industry, which is not as good as you...... It's all dry guys! ”

Lu Heng smiled, and it was very unusual that he did not add fuel to the fire.

After all, whether the Qin Dynasty used a large number of wooden rails was finally confirmed more than ten years before he traveled.

Some scholars have excavated the ruins of wooden rails in the Qin period, and the principle is no different from that of modern railways, or double lines. The wood is hard, anti-corrosive, and is still well preserved, so it should be specially selected and made for the track.

The distance between the sleepers coincides with the pace of the horse, so that once the horse goes up, it is difficult to stop, so this "railway" should be pulled by horsepower. There may also be a special station, or a special place to park, for the horses to rest.

On top of that, the modern use of carbon-14 testing confirms that the orbit is more than 2,200 years old.

No one in Datang can think of it, it's too normal!