An iron railing door, under the lifting of the pole, was slowly hung up, and then, a group of people pulled one end with a rope and fixed it on the track.

The pulley that pulls the rod is no longer the earliest wooden wheel, but has been replaced by the latest cast iron wheel, that is, the pole, or the wooden pole, but there are some iron parts inlaid in the load-bearing place, and the rope of the pull rod, as well as the rope for lifting, is still a thick hemp rope, the disadvantage of using the rope is that it needs to be replaced more frequently, but compared to their usefulness, this rope is nothing.

This pole pulling, compared to Yang Qiao's previous life, just replaced the mechanical or electric power with human or animal power, but this is also good, and there will be fewer accidents.

The two iron gates, with the assistance of this pole, are fixed to their positions, and at this time, this iron gate still needs to be fixed with some wooden poles, until the battlement bridge above is repaired, can be officially used.

In other words, the construction of the Datang Railway has officially started now, but the day of the real start of construction, or the day of the groundbreaking ceremony, needs to wait for the day of Qintian's supervision, and Li Er will start it.

At this time, it can be seen that the benefits of reinforced concrete are coming, it is said that the city gate is a kind of arc-shaped structure, and at this time, the beam above the iron gate is a reinforced concrete structure, especially this steel bar, which is specially made of rebar according to Yang Qiao's requirements, although it may not be up to standard, but it can also reach the level of Yang Qiao's previous life of the earthen factory.

In other words, when Yang Qiao went out to fight, the craftsman of the Tang Dynasty Ministry of Industry solved a big problem for him, that is, the problem of steel number.

Or, perhaps, from now on, some primitive machinery industry, will begin to appear, in this way, Datang rampant in Asia, should not be a problem, maybe, before Li Er's hiccups, the Datang railway, has been the southern end of the South China Sea, the northern section to the Arctic Ocean east to the Wako Island, the western section to Europe.

Yang Qiao's plan is that where my Datang Iron Horse goes, it is where the railway goes, and where the railway goes, it is my Datang territory.

Moreover, Yang Qiao believes that Li Er has this ability.

Because of the height of the city gate, the beam above it was halfway up, so on top of this beam was built another house, and above the house was the battlements, and the passage of the city wall, and above the passage of the city wall, there was the wooden bridge, that is, what was under the wooden bridge, some vertical railings?

In fact, this wooden bridge is no longer a pure wooden bridge, in order to facilitate replacement, and there is also to prevent the following beam from bending, so this is the use of cables, and the two arcs of the wooden bridge are also made of steel, and it is designed after careful calculation.

Because of the problem of the house above, this section of the city wall has become the weakest link in the defense, but it is also because of this house that it has also become a meat grinder within the defensive range of this section of the city wall.

Because, in this house, except for the place where people move, everything else is defensive arrows, and once the offensive and defensive battle is opened, a few people will come in here, and then it will be defended for more than a month, without support and without being breached.

However, Yang Qiao estimated that within a hundred years, these equipment would not be needed, so only half of the weapons and ammunition were reserved in this house.

This only talks about ammunition, what is that weapon, weapon, naturally, it is a crossbow, but this crossbow is not a strong crossbow, but a defense-breaking crossbow of more than 100 meters, and it is a net-like defensive design.

This design, as long as the defenders do not doze off, it can be said that until the ammunition is exhausted, no one will attack the city, because this is a simple defense, naturally, this defense, can meet this standard.

On top of the defense-breaking crossbow, there is also a sniper crossbow, if it is said that a small number of people will attack, then well, this sniper crossbow will be a meritorious service, but don't consume more arrows.

This sniper crossbow can be rotated up, down, left and right, so the range of defense is very wide, and the distance is also far, naturally, the speed will not be fast, but this is enough.

This is Yang Qiao's guarantee to Li Er, the city wall has been transformed, and the defense is naturally much tighter.

At the same time, the transformation of this city wall was completed, and this transformation was also started outside the east city wall, that is to say, this small Chang'an City, at the beginning of the establishment of this railway, there were two stations, one is Chang'an East Station, and the other is Chang'an South Station.

Li Er's plan is to build the North Station and the West Station, but these two stations do not need to break the city wall.

However, why is it so close, and what is the difference between South Station and East Station?

In fact, Li Er also had this question at the beginning.

"Holy Lord, look, this is the territory map of the Tang Dynasty, this South Station, it will be scattered to this side."

Yang Qiao's fingers followed the lines of some roads on the territory map, which was roughly the line of the railway.

"And this east, it will disperse in this direction."

Li Er nodded thoughtfully.

"If you go this way, you'll pass through the city!"

Li Er understood Yang Qiao's real idea, no matter what accident happens, it is difficult to achieve the effect they want if you want to transport it by rail, so this design is very reasonable.

"So, what if I need the West Station and the North Station?"

"This doesn't need to go through the city anymore, you can set up a checkpoint here, usually, this checkpoint is closed, that is, this train will not be allowed to pass, but it will not affect other actions, but it can only be passed when needed."

Especially the most important thing is that these two so-called checkpoints can become a cargo distribution center, so that some large-scale transactions or something can completely avoid entering Chang'an City.

As soon as he heard that he could still make money, Li Erke was overjoyed, money, money, money, but what he wanted the most, with money, he could do a lot of things.

If you want to make money, you have to invest first, which is also the experience that Li Er has thought about in recent years.

"Okay, you say, how much do you need to invest, I want to put these East and West stations into work as soon as possible."

"Hey, saint, saint, actually, I'm also in a hurry, sometimes, it's not that you can solve the problem if you have money, but the biggest problem now is that we lack people!"

Yang Qiao said to Li Er with some tears and laughter.

"Lack of people, how much is missing, ah, I thought wrong, did you say, lack of technical personnel, this, I really can't help it, how is your technical school?"

"What's the matter, it's on the right track, but there are still fewer teachers, let's cultivate it slowly, so, some things, you still can't be in a hurry, you haven't found it, you want to do a lot of things now, but, I think, don't be in a hurry, take your time one by one, now, how to say it, it should be said, a hundred wastes are waiting to be revived, you think about one thing casually, you are in a hurry, so, you can't be in a hurry."

"Alas, okay, let's do what you say, take your time, don't worry, don't worry, ah, no, I still have to go and see the map of thousands of miles of rivers and mountains!"

Li Er left in a hurry, and actually left Yang Qiao here alone.

"Well, well, I'll leave on my own."

Yang Qiao shook his head helplessly and left.

And Li Er, he was looking at the picture, slowly calming down, just now, the prospect that Yang Qiao portrayed for him was too tempting, so his blood boiled, this boiling, it was terrible, this heart disease, it may be induced, Yang Qiao didn't notice this, noticed, but, he had no way about this, it was not as good as Li Er's imperial doctors, they, for Li Er's body, still have a better understanding, once something happens, although they can't cure it, but, provide, It's still possible.

However, at this time, Li Er didn't use any imperial doctors or anything, and it became the eldest grandson.

"Second brother, why are you so excited, look at you, your face is red."

The eldest grandson pinched his shoulders behind Li Er and looked at the picture together.

"Second brother, look at this mountain, feel, feel ......"

"This, it should be Huashan, it is said that there is a group of Taoists, is digging the road up the mountain, before, I also passed there, the mountain, there is really no one to go up, this painting is not bad at all."