Unexpectedly, the Tang army did not attack immediately. Hearing only a muffled sound, a cloud of white smoke rose from the position of the Tang army, and then, dozens, things the size of a millstone flew in, some fell on the city wall, and some fell into the castle.

The Tibetan people had seen the stone thrower, and when they saw something flying slowly, they all felt strange, thinking that the other party was going to rely on such a thing to stone people to death, which was a bit too stupid.

Suddenly, a loud explosion sounded inside and outside the castle, and after a puff of smoke, there were basically no living people in the castle near the gate.

A few thunderbolts also fell into the gate hole, and the ox carts blocking the door were also scattered and splashed by the explosion, revealing a passage.

Tian Hao commanded the Tang army to storm the castle and quickly purged the Tubo inside.

By the time Tian Hao entered the castle, the soldiers had already started looting inside.

After a short time, Tian Hao's logistics director came over excitedly and said, "Captain, we have made a fortune." ”

Midaha died, and all the treasures accumulated in the castle for hundreds of years became the trophies of the Don army, and the gold and silver treasures alone filled nine ox carts.

The officers and men thought that two-thirds of them would be distributed to everyone, and they were all smiling.

The Tang Army's current sophisticated equipment is garbage in the eyes of later generations, but in this era, for the Tubo people, it is the existence of black technology.

Two days later, the Tang army crossed the Nu River and advanced deep into Tibet.

At the test base of the Ministry of Science and Technology, after many tests, the first steam engine was born.

On this day, Li Su and the bigwigs of the Government Council, accompanied by Huang Qi, watched the test run of the steam engine.

With a roar, the steam engine ran smoothly, and the experiment was successful.

The engineers cheered, and so did the crowd.

Li Su looked at the steam engine invented by Datang, and sighed infinitely in his heart, this is the real beginning of Datang's industrialization.

Li Dan, an expert, said excitedly: "With this motivation, industrial production capacity can be at least doubled." ”

Li Su said with a smile: "Supporting some transmission devices, rational use of this power, and the improvement of production capacity are not only a matter of double, but ten times or even more." ”

Li Dan immediately decided to establish a steam engine manufacturing plant in Chang'an and Yangzhou.

The steam engine was soon applied to various industries, which greatly improved Datang's labor productivity.

The problem of commodity circulation has become the key, and the biggest factor affecting circulation is the problem of transportation.

The transportation in the Tang Dynasty mainly relied on horse-drawn carriages, which took a lot of time, not to mention, the cost was too high, and it was a lot of money to eat horses and chew along the way.

The next thing Li Su had to solve was the transportation problem, and the first thing he had to do was to build the railway.

With the steam engine, it's not far from the train.

Li Su chose the technical level of railway construction in the early 19th century to develop the railway construction of the Tang Dynasty.

Railway construction is not a simple matter, involving all aspects of Datang's industry, such as steel rails, and the current steel processing technology of Datang cannot produce standardized steel rails.

Li Su decided to first introduce the steam engine to the steel industry, and built a large-scale rolling mill based on the construction of railways.

It can be said that the completion of Datang's railway transportation will mark a stage of Datang's scientific and technological progress.

Tai Chi Palace, Li Su's study.

Li Su sat on the sofa, holding a copy of the information, and laughed while reading.

He looked at the material, which was a document on the construction of trains and railways.

According to the source, the standard gauge of the railway in the world was determined by the horse's butt in Rome.

The standard railway gauge used in the world is 1.435m.

This number has horns and flutes, is it through the rigorous calculation of science? This is absolutely none, and it is still a very ridiculous reason.

The British were the first to invent the railway, so no one calculated how much the railway track should be before, and when the British train was manufactured, the British people who made the horse-drawn carriage axles were found to make the axles of the train, and the people who made the horse-drawn carriage axles made a solid train axle according to the horse-drawn carriage, so when the train axle was 1.435m, of course, the distance of the train rails must also be this number.

Why is the British carriage axle 1.435m, because the British road at that time was basically so wide, and there were two deep ruts pressed out of the road, so the carriage axle must also be made according to this size to be easy to drive on the road, so the British carriage axle is 1.435m.

Why are there two deep ruts on British roads? In fact, the deep ruts left a thousand years ago were when the Romans ruled England, and after the Romans withdrew from the ruts left by the roads, the roads remained, and the deep rut marks on the roads remained.

Why is the rut mark left by the Romans 1.435m, because this is when the Romans built the ancient high carriage road, the carriages running on the road are basically two horses pulled by one carriage, and the two horses are fat and strong, and the distance can not be too crowded and not too far, so the decision is that the distance between the buttocks of the two horses cannot exceed a fist, nor can it be lower than a fist, so the axle distance of the two carriages is 1.435m, so the axle of the Romans is 1.435m.

The butt of the two horses is 1.435m wide, so the Roman axle is 1.435m, so the rut mark in the UK is also 1.435m wide, the horse carriage axle in the UK is also 1.435m wide, the British train axle is 1.435m wide, and the British train track distance is also 1.435m wide, the world's trains are all imported from the UK, so the train track distance in most countries in the world is 1.435m, and the horse butt in Rome decided that the train track distance today is 1.435m.

Seeing this, Li Su couldn't help laughing.

At this time, Wei Zheng, Li Dan, Huang Qi and the Minister of Communications and others all arrived.

Li Su pointed to the various pictures hanging on the wall and said: "This one is called a train, and the bottom is called a railroad track...... and he did it himself, and gave them some science popularization about the railway.

Wei Zheng stood up, took a closer look at the picture, and said, "Your Majesty, is it true that you said that this train can transport goods transported by hundreds of carriages at one time?" ”

Li Su said with a smile: "The current research of the steam engine, the power is still insufficient, if in the future to develop a larger power machinery, transport thousands of carriages at a time, it will not be a problem." ”

Wei Zheng said: "That's great, the traffic problem is a big problem, not to mention anything else, just to the summer harvest and autumn harvest, the transportation of grain, is a big problem in the whole country, the road is congested, the loss on the road is also very huge, with this road ahead, but the big problem is solved." ”

Li Dan said: "The prime minister is right, with this railway, it will have a great role in promoting the industrial production of Datang, and the minister resolutely supports the construction of the railway." ”

Li Su decided to set up a railway bureau under the Ministry of Communications. The Railway Bureau is responsible for the first construction of the train from Chang'an to Weinan, and after the completion and opening to traffic, the railway from Weinan to Luoyang will be built, and then gradually expanded according to the situation.

Wei Zheng looked at Li Su, a little dazed, he held back for a long time, and finally couldn't help asking: "Your Majesty, over the years, you have continued to come up with inventions and creations that benefit the country and the people, which have greatly benefited the people of the Tang Dynasty."

I would like to ask, where did you get all these wonderful ideas? ”

Everyone also looked at Li Su expectantly, waiting for his answer.