Stopped in front of me was an old-fashioned Soviet-made car, and in '84, even in Beijing, the number of cars was very different from that of later generations. Especially at this time, the number of private cars is almost none, and those who can use cars are all the heads of the government or companies. "Uncle Su, it seems that your family is still an official?" After getting into the car, Fang Mingyuan asked Su Aijun in surprise.

"This is my father's light, and it is your light. Su Aijun twisted back from the passenger seat and looked at Fang Mingyuan with a smile. After the detailed conversation on the train, Su Aijun subconsciously regarded Fang Mingyuan as a person who could talk to him on an equal footing.

"What do you mean by this, what does it mean to touch your father's light and also touch mine?" Fang Mingyuan asked puzzled. How did this get involved with Su Aijun's father again.

"Actually, it's my father who wants to see you today, he works for the Ministry of Railways, and he is very interested in what you said about the speed up of trains, so I want to talk to you. This is my father's official car, and I can't usually sit on it, so it's my father's light, and it's also your light. Su Aijun explained with a grin.

"Your father wants to see me?" Fang Mingyuan was even more taken aback. The capital of eighty-four years is not as good as that of later generations, and it is not small to be able to have official cars. I didn't expect that I would casually talk nonsense with people on the train, and I actually had something to do with the officials of the Ministry of Railways. This plot is too bloody. How could it be such a coincidence?

Bai Lin was even more taken aback, he was in the capital, and naturally understood the meaning of this invitation better than Fang Mingyuan. Although I also heard Bai Ping and the second elder of the Fang family say that Fang Mingyuan was on the train, bluffing a teacher from Fengyuan Jiaotong University, everyone listened to it as a joke at the time, and now it seems that what Xiao Mingyuan said must be reasonable, otherwise how could it be possible for a senior official of the Ministry of Railways to want to see him a seven-year-old doll?

Fang Mingyuan's mind was spinning, this was a rare and good opportunity, didn't he worry about the lack of help in the system a while ago? This help jumped out by itself! Although this grade is inevitably a little too high, it will definitely not be needed for a while, but as long as he has a good relationship with the Su family, he will be useful one day in the future. Ministry of Railways, Iron Boss, this is a behemoth that was unbeatable in the previous life. What's more, what is he afraid of, that is, what is wrong, he is embarrassed to be more serious with his seven-year-old self? As soon as he thought of this, Fang Mingyuan had the bottom in his heart - the risk is small, the profit is big, and this deal can be done!

Su Aijun also secretly admired in his heart at this time, it was really rare for this little guy to be so calm when he heard such news. His uncle, on the other hand, looked a little nervous.

Soon, the car drove into the family compound of the Beijing Bureau of the Ministry of Railways and stopped at the door of the Su family. Old Mrs. Su came to open the door when she heard the sound, and saw Fang Mingyuan at first sight, the child was very beautiful and very energetic, and she couldn't help but like it a little more.

"Mom, this is Fang Mingyuan, and his uncle Comrade Bai Lin. Comrade Bai Lin, Xiao Mingyuan, this is my mother. Su Aijun introduced succinctly.

"Hello Grandma Su!" Fang Mingyuan said with a sweet mouth, and said first, "I came here today in a hurry, and I didn't bring a gift to grandma, it's really rude!" But Uncle Su is to blame for this, and he didn't say hello in advance!" Originally, Fang Mingyuan thought about buying something on the road, after all, it was not very good-looking to come to the door empty-handed. But the sudden sedan completely made Fang Mingyuan forget about it. When I got out of the car, I reacted. But there is nowhere to buy it.

Mrs. Su smiled kindly and said, "It's okay, you don't need to take any gifts, just come." Come on in. Regarding this child, she has listened to her husband and son a lot in the past few days, and today it seems that it is really different from ordinary children. It's a bit of a little adult.

After letting Fang Mingyuan and Bai Lin sit down in the living room, after Mrs. Su brought tea to the two, Su Aijun went upstairs to the study to find Su Huandong.

"Comrade Bai Lin, where do you work?" asked Mrs. Su with a smile. Seeing that Bai Lin seemed to be a little nervous, the old lady deliberately chatted with him a few more days.

"Huh?" Bai Lin, who was looking at the furnishings in the living room, was stunned for a moment before replying, "Ah...... I work for China National Books Import and Export Corporation, a junior deputy department. As the conversation continued, Bai Lin gradually let go.

"Mingyuan, come up!" Su Aijun poked his head out of the stairs and said.

Fang Mingyuan looked at Bai Lin, this is outside, and the majesty of the elders should be paid attention to. Bai Lin nodded, and Fang Mingyuan walked over.

Su Aijun arranged Fang Mingyuan in the small living room on the second floor, where there was a sofa and a lot of old-fashioned furniture. The house can only be said to be relatively spacious, but it is not luxurious.

was looking curiously left and right, the door of the house opened again, and an old man of about fifty-five or sixteen years old walked in, not low, with short hair that was half black and not white, and in appearance, he was somewhat similar to Su Aijun.

"Hello Grandpa Su!" Fang Mingyuan jumped off the sofa and shouted in a proper manner.

Su Huandong looked at Fang Mingyuan, although the clothes were very simple, but the child looked very cute, and psychologically, he had a little more affection. "Sit down, don't be so restrained, do you have anything you want to eat or drink? Aijun, go get a bottle of soda. ”

The three chatted for a while, and Su Huandong asked Fang Mingyuan about his studies and family situation, and then asked them what they had seen after coming to the capital. This slowly turned the conversation to the railway. The more Su Huandong talked about this, the more surprised he felt, although Fang Mingyuan said it was still a fairy tale, but it could be seen that he had a lot of opinions on the matter of speeding up the railway. And these views, although at first glance, seem to be a little unreasonable, or do not match, but after careful consideration, there is a reasonableness.

"Xiao Mingyuan, do you think that before the train speeds up, we should do a good job of changing the railway level crossing to an overpass?" Su Huandong pondered for a moment and said, "Although in the long run, I think what you said is very reasonable, this is also the general trend." However, judging from the recent stage, I am afraid that this fee will not be easy to approve. And I do not believe that, as it stands, there is a need for this work to be carried out immediately. Our country is still very poor, and every money must be spent on the blade!"

"Grandpa Su, I once saw a term called 'path dependence' in the book, which is similar to 'inertia' in physics, which means that once you choose to enter a certain path, whether it is haode or bad, you may become dependent on this path. For example, the standard distance between two railroad tracks in the United States is 4.85 feet. It's a very strange standard, do you know where it comes from?" Fang Mingyuan asked with a mischievous look. "This is the British railway standard, because the railroad in the United States was first designed and built by the British. This problem is not difficult for Su Huandong, who has been up and down in the Ministry of Railways for decades, and has accumulated a lot of professional knowledge.

"So, Grandpa Su, what about the Weishenme British people who want to use this standard?" Fang Mingyuan asked.

Su Huandong frowned, pondered for a moment and said uncertainly: "I remember that this standard is also the British tram track standard, it seems that in the UK, trams appeared earlier than railways!"

"Grandpa Su is wise!" Fang Mingyuan said with a thumbs up, "Sure enough, it is worthy of the Ministry of Railways, you know this." "It turns out that British railways were designed by the people who built tram tracks, and this 4.85 feet is the standard used for trams.

"So where did the standards for tram tracks come from?" Fang Mingyuan continued to ask.

Su Huandong couldn't help but get stuck, he really didn't know about this thing. It is not easy to know and remember the gauge between the rails, and who would think that Weishenme set this standard in the first place.

Fang Mingyuan revealed the mystery at this time. It turns out that the first people to build trams used to build horse-drawn carriages, so they used the wheel width of horse-drawn carriages as a standard. The new question, then, arose that the carriage should use this size as the standard for wheel distance, for if the carriage had used any other wheel gauge, the wheels would have been broken very quickly on the old roads of England. Because the ruts on these roads are four .eighty-five feet wide. Then a new question arises, where did these ruts come from? The answer was determined by the ancient Romans, and 4.85 feet was the width of the wheel base of the Roman chariot. If anyone were to drive on these roads with different wheel widths, their wheels would not last long.

"So what would the Weishenme Romans use this standard for the wheel base width of their chariots?" Su Huandong couldn't help but ask. Although I don't know whether this is true or not, logically speaking, it is very reasonable. It doesn't look like a child made it up himself.

"The reason is very simple, because this is the average width of the butts of two horses pulling chariots!" Fang Mingyuan's answer was much more than Su Huandong expected. But when you think about it, it makes sense.

"So, Grandpa Su, the design of the most advanced transportation system on Shijie today was determined by the width of the buttocks of two horses two thousand years ago. This is path dependence, which seems paradoxical and humorous, but it is true. Fang Mingyuan said solemnly, "If you, the initiator of the railway speed improvement plan, do not pay enough attention to it, or even ignore it, then others will pay less attention to it." When the speed of the train is increased to 100 kilometers, 200 kilometers or even 300 kilometers in the future, these crossings will be a trap for killing, and if you think about changing them at that time, the price you will pay will be too great!" Now that he has such a rare opportunity, Fang Mingyuan naturally wants to give Su Huandong a preventive injection in advance, if he can pay enough attention to this matter, then those tragedies in the future can also happen less.

Su Huandong leaned back on the sofa, closed his eyes and pondered, he had to admit that the little guy had a point......

PS:Yesterday's temporary trip to the hospital.,Caused today to be squeezed into thirteen.,Ask for a recommendation and ask for a collection.,Exploded the juhua in front.This chapter is to make up for yesterday.,There's another chapter in the evening.