Li Zhen and the others sat in the high-class carriage, and poked their heads out of the window to look at the front of the car with great interest.

'Woo woo'

Smoke billowed from the front of the car, and a distinctive whistling sound followed.

'Smack, snort, snort'

The distinctive sound of the train sounded, and twenty trains began to move slowly forward.

The people walked alongside them, pointing:

"It's a bit slow. 、”

"I don't know what speed this train can reach when it runs."

"One locomotive, with so many carriages, when the time comes, it will be heavier to sit on people and pull goods. I'm afraid the speed will be a little bit lower. ”

"You look like you've run two or three hundred meters away, and I can still catch up with me at a trot."

"But it's okay to slow down, it's better to do this steadily than in a car."

“……”

Li Zhen also felt that this speed was a little slow, and after running a mile, the speed only reached about thirty miles. According to this trend, its top speed is probably only about 80.

Eighty or so is still a bit slow comparatively. And this speed is also the limit of the power of the locomotive that can be produced at this level of production today.

"Really, the train runs fast because of the headband."

Li Zhen sighed. By the time I had run five miles, my speed had increased by sixty. Li Zhen was a little dissatisfied, but everyone here enjoyed it.

"I think it's okay at this rate."

"Sixty miles is a constant speed. It's always at this speed, and there is no traffic jam, so you don't need to think about road obstacles. Just run forward. ”

"The highest should not be eighty, at most around seventy."

"My only concern is that there will be too many stop-and-go sites in the future. The speed just got up and you had to brake. It's too much of a waste of time. ”

"There is no way to solve this power problem, it seems that we can only set up fewer sites, and simply eliminate sites where they are not necessary."

"Gentlemen, I have a question that I don't know whether to talk about it or not."

"What's the problem?"

Everyone looked at Liu Jinghong.

Liu Jinghong pondered for a moment and said: "There is only such a track, straight up and down." It's okay in the past, but what about coming back? Set up a crane at the terminal station and switch the locomotive to another position? Wouldn't that be a bit too much trouble? ”

Everyone was stunned for a moment, and then laughed again.

"That's enough."

"I think it's okay to be troublesome."

"There's no way around it."

"The locomotive is not too heavy, and the locomotive is hoisted from the front to the back with a crane, and the head becomes the tail, which can also be solved."

"The position of the carriage does not need to be changed. It's just a matter of changing the front of the car. ”

Liu Jinghong nodded thoughtfully: "Isn't it necessary to set up a crane at each terminal?" In this way, it has also increased manpower and material resources, and some of them are not cost-effective. ”

Li Zhen nodded: "I think this question is very good." Now the train is not mature, everything has to be done slowly, and if there is an opinion, it must be put forward and corrected. Constantly turning the locomotive into a tail is indeed a bit too troublesome. Do you have a better solution? ”

The crowd fell silent.

Since Li Zhen has raised this issue, it is necessary to solve this problem and can no longer ignore it.

Jia Liping said: "Otherwise, the track of each terminal station will be built into a circle. When the train reaches the terminal and keeps moving forward, it can make a circle and then merge back onto the original track, so that the train does not need to turn around. ”

"Dean Jia's suggestion is very meaningful."

"I think Dean Jia's proposal is good."

"Yes, yes, yes. Turn the track at the terminal into a circle, and the train can keep moving forward to make a U-turn. ”

"No, I don't think that's a good suggestion. Although there is only one track from Laoshan to Quancheng County at present, in the future, train tracks will be laid all over the country. Do you want to set up a circle track U-turn at stations all over the country? With so many regions in the country, which station is the so-called terminal station? ”

As soon as these words came out, everyone fell silent again.

Li Zhen was also thinking, how could this train turn around?

Everyone was thinking that the train had traveled dozens of miles and came across a hillside.

When it hit a hill, the speed dropped suddenly, and the train began to climb. But it was not so easy to climb the hill with twenty wagons on it.

The speed slowed down and finally stopped. He paused for a few seconds and then slowly moved forward.

Li Zhen and the others were speechless with their mouths open.

"This motivation ...... Too weak, right? ”

"You can't climb this mountain."

"It's over, the train track was only built to one county before, but now Laoshan to Quancheng County has been completely repaired. There are a lot of mountain trails and steeper slopes, so what should I do? ”

"If you can't climb up and break, what if the train is stranded in this deep mountain forest? You can't go back if you want to. The crane can't come to this place, and if it can't cross this slope, won't the train be wasted? ”

"How's that okay?"

“……”

Everyone in the carriage stood up.

The manufacturer of the train was even more nervous, standing in the corridor and constantly looking out, stomping his feet in a hurry.

Who would have thought that there would be so many variables in the future? I can't even climb to break, how can you be good.

Li Zhen poked his head out of the car window and looked ahead, there was still a large slope above. And the locomotive was making a high-pitched whistling sound, like a brute bull rushing upwards with all its strength.

The effect was there, the train did not stop completely, it was moving slowly.

But what a line?

When the time comes, the train pulls people, pulls goods, heavier cases. What should I do if I encounter this broken again? If you say it's stranded, it's stranded, and there is a limit to the machine.

When Li Zhen was really worried, a young man named Zhan Youtian from the Mobile Academy suddenly screamed: "I have a way!" ”

"What's the solution?"

"Alas, your method is useless. This is the limit of power, and it goes without saying that if you cut the carriage or something, this is the only way to go. ”

"You don't even have anything to reduce the slope, it's impossible, it's almost equivalent to moving mountains and reclamation projects, and it's better to build tunnels if it costs too much money."

"Well, there is no way."

Zhan Youtian's face flushed in a hurry: "I really have a way, I have thought of a way to solve the problem of weak train power, and it can also solve the problem of the train turning around." From now on, the train will be able to make a U-turn anywhere on any stretch of road. There is no need for a crane. ”

Everyone was breathless, and they all looked at him with some doubt and disdain.

Li Zhense asked, "Young man, what can you do?" Tell us what you think. ”

Zhan Youtian took a deep breath and said excitedly: "Master Li, we can set up two locomotives. A locomotive in front and a locomotive in the back. When you go forward, the locomotive in front generates a pull force, and the locomotive behind you generates a thrust force. In this way, the problem of power is solved. When you arrive at the terminal and need to return, the tail becomes a head. The locomotive in the back becomes the front, and the front becomes the back. There is no need to make any U-turns, there is no need to change the head, just the front car becomes the rear car, and the rear car becomes the front car. The power problem is solved, and so is the U-turn problem. ”

“……”

Zhan Youtian finished speaking. The whole carriage was silent, and the needle drop could be heard.

Everyone looked at each other, unable to say a word.

Zhan Youtian blushed and said, "I, did I say something wrong?" ”

Li Zhen took a deep breath and looked at Zhan Youtian with a straight face: "Thank you for solving a problem that trapped everyone, young man, thank you." ”

'Bang Bang Bang'

Li Zhen took the lead in applauding.

In the whole carriage, everyone looked at Zhan Youtian, who was shy and blushing, and gave him the most sincere applause without hesitation.

The applause lasted for a long time in the carriage.