Under Master Wang's explanation, Liu Pengcheng finally knew what he meant when he said "it is impossible to derail and overturn under any circumstances".

Whether it's a toy train or a real train, there are two necessary conditions for derailment. The first is that the center of gravity of the body has shifted. The angle of the offset was enough to overturn the carriage. The second is when the wheels leave the tracks.

Generally speaking, the first case that satisfies these two items is to overspeed and turn at a large angle. The second is that there is very strong debris on the tracks, and the third is that the train has hit something, such as a barricade or another train.

And in the case of the cartoon train in the children's park, its maximum speed is not enough to overturn it. And every time before the departure, the technician will take a general look at the line, and there is no possibility of hitting something, after all, the technician is not blind, and he can't see anything that can knock over the small train.

As for the debris on the rails, this is not possible, because the first car of the small train, that is, there is a wrecker in front of the front of the locomotive, which is the pointy, red thing that clings to the rails. That thing is really on the locomotive, and that's to remove debris from the tracks.

The wrecker of the small train is different, and the unstable debris on the rails is pushed aside by it. If the clutter is hard and sturdy enough, that's not afraid either. There is actually a small spring mechanism behind the wrecker of the small train, and the wrecker will shrink back when it encounters a hard object, triggering the spring mechanism, and the whole small train will be powered off and stopped in an instant.

Since the speed of this small train is very slow, there is almost no inertia and no kinetic energy. Therefore, Master Wang said that it is impossible for the small train to capsize, even if it encounters an accident, the big deal in the end is to stop. And it shouldn't be down.

According to Master Wang, he checked the obstacle cleaner and the circuit disconnection protection device behind the accident as soon as the accident occurred, and there was no abnormality.

What's going on?

At this time, Liu Pengcheng's phone rang.

Liu Pengcheng picked it up, and it was actually Secretary Ma's phone.

Liu Pengcheng hurriedly greeted: "Hello Secretary Ma, I am Liu Pengcheng, what instructions do you have?" ”

Secretary Ma asked, "Xiaoliu, are you in the children's park?" ”

Liu Pengcheng said: "Yes, I am in the children's park. ”

Secretary Ma said: "I'll tell you about some situations. The little girl who died in this accident is the granddaughter of Li Lao in our city and his youngest grandchild. Speaking of Li Lao, you are a foreigner, you may not know, he is the founder of the development of Pingzhou, it can be said that without Li Lao, there would be no current Pingzhou.

It was also during the reign of Li Lao that he first proposed to incorporate Qinghu into the overall strategy of Dapingzhou, which led to the later withdrawal of Qinghu from the county and the establishment of districts, forming the overall outline of Pingzhou City. The world is impermanent, we can't change the ending of the white-haired person sending the black-haired person, but we have to give the old man an explanation, do you understand? ”

What did Liu Pengcheng say, saying that he didn't understand? The leaders of the people said that they understood it so clearly, how could he not understand it! I had to say: "Secretary Ma, rest assured, we will do our best to solve the case." ”

Fortunately, Secretary Ma asked again: "Is there any difficulty?" ”

Liu Pengcheng said: "There really is, Secretary Ma, we need an expert in machinery, and we can't rely entirely on the people in the park." ”

Liu Pengcheng said this, Secretary Ma understands, to a certain extent, before the case is solved, the park understands machinery, especially the people who understand the small train, should be suspicious. They really can't be fully expected to solve cases.

Secretary Ma said: "I'll solve this difficulty for you, you wait." ”

hung up the phone, the support of the city bureau also arrived, and to Liu Pengcheng's surprise, it was Lao Gao who led the team.

Lao Gao was also very happy to see Liu Pengcheng: "Liu Bureau, the task force has no task for the time being, and they have all been transferred here to support you, you can take a look at the assigned tasks." ”

Liu Pengcheng said a brief introduction to the case and said: "After the self-inspection of the park, the wrecker of the small train and the power-off protection device behind the wrecker are normal, and it is this normality that makes me believe that this must be a criminal case."

Your task now is to strictly screen the two groups of staff of the cartoon train, especially the two mechanics and two technicians, they have technology, and this case should be a high-IQ crime based on mechanical technology, your task is to find out the trivial things of these two groups of people, the bezoar dog treasure. ”

This is the most basic and oldest criminal investigation method, Lao Gao nodded: "Don't worry, I will assign them all." ”

At this time, the director of the trace examination center came over and shook his head at Liu Pengcheng: "Liu Bureau, nothing has been found. ”

Liu Pengcheng asked, "Do you have a metal detector?" ”

The director shook his head: "No! ”

Liu Pengcheng asked again: "Does the city bureau have it?" ”

The director shook his head: "Neither does the city bureau." ”

Liu Pengcheng thought that if there was a "thing" that could "deceive" the wrecker and cause the small train to derail and overturn, then this "thing" must be metal. There is little doubt about this.

Liu Pengcheng called Uncle Bai directly and offered to borrow the army's metal detector.

Liu Pengcheng dared to guarantee that the troops would definitely have metal detectors, and once this equipment joined the army, it would be renamed "mine detectors."

Uncle Bai didn't even think about refusing Liu Pengcheng's request. Uncle Bai said, "What is a metal detector? I call this military equipment! Have you ever heard of the loan of military equipment? ”

Hearing Uncle Bai say this, Liu Pengcheng wiped his sweat himself, and said in his heart that he was really floating. For sappers, the metal detector is someone's "gun", how can anyone borrow it!

Now Liu Pengcheng has no curse.

Seeing that Lao Gao and the criminal policemen had already begun to "chat" with the staff of the cartoon train, Liu Pengcheng personally led the police officers from the police station to look for it again at the scene of the overturning of the small train, but still found nothing.

This is not to blame the police door, no one knows what Liu Pengcheng is looking for, even Liu Pengcheng himself does not know what he is looking for, he just knows that what he is looking for is "the wreckage or parts of some device that can deceive the wrecker and capsize the small train" As for the wreckage or parts, whether they are round or flat, copper or iron, long or short. Director Liu doesn't know anything!

At this time, a 212 military vehicle drove over.

A lieutenant got out of the car with a second-class non-commissioned officer, and after inquiring, he found Liu Pengcheng.

This was sent by Uncle Bai.

It is impossible to lend military equipment!

But aren't you looking for something? We can help you find it!

Liu Pengcheng didn't go to look at them to find something, but found a step to sit down and rest for a while.

Xiao Yang went to open the car door and took out a few drinks. handed it to Liu Pengcheng and drank it himself.

Now Liu Pengcheng has to wait, if these two soldiers haven't found anything, then they can only rely on the interpersonal relationships of the team or something. However, Liu Pengcheng can't guarantee 100% that it was done by the team members.

Without key physical evidence in hand, there is no confidence to solve the case, especially this kind of brainless case. Now that Master Wang is still wondering why the little train overturned!

At this time, the non-commissioned officer ran over: "Director Liu, our company commander has found something, I don't know if it's what you're looking for, go over and take a look." ”

Liu Pengcheng hurriedly followed the non-commissioned officer and ran over.

Several police officers who have been inspected are surrounding.... A tree?

The captain had already taken off the headset of the mine detector and sat on the grass on the side, it seemed that he was very confident that what he found was what Liu Pengcheng was looking for.

Liu Pengcheng trotted a few steps over.

A cement nail, most of which was driven into the trunk of the tree.

Liu Pengcheng almost immediately decided that this was what he was looking for!

Liu Pengcheng hurriedly went up and shook hands with the lieutenant to express his gratitude!

The lieutenant stood up without seeing the strength of his hand.

With a grin, he said, "Found it, we should go back!" Are you Liu Pengcheng? Liu Zhuangzhuang's younger brother? ”

Liu Pengcheng was taken aback, "Liu Zhuangzhuang" was his second sister's nickname when she was a child, a girl relied on a pair of fists to give herself such a nickname in the compound, it is really difficult to explain.

However, Liu Pengcheng basically never lost, and he reflexively replied: "Yes, I am." Are you my second brother-in-law? ”

The lieutenant's face changed: ", don't curse me!" ”

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