Liu Yimiao walked into the subway R&D center, where she also learned about the history of subway development.

At the beginning of the founding of the People's Republic of China, Beijing had a resident population of less than 3 million and only 5,000 motor vehicles. At that time, the construction of the subway was undoubtedly very labor-intensive, material-intensive and financial. Premier Zhou said: "Beijing is building the subway entirely to prepare for war, and if it is for transportation, it is enough to buy more than 200 buses." ”

In 1953, the construction of the Beijing subway began, but due to the lack of relevant technology and talents, the Beijing Municipal Party Committee reported that the central government had imported talents from the Soviet Union. Two years later, the Soviet Union sent five experts, headed by Baryshnikov, deputy director and chief engineer of the Moscow Metro Design Institute, and several other members were also involved in the construction of the Moscow Metro in 1931. They not only brought a lot of detailed technical information and rich experience in the construction of the Moscow subway, but also gave many enlightening lectures on the subway for Chinese technicians. China also sent talented people to study in the Soviet Union.

With the help of Soviet specialists, after several years of hard work, the master plan for the Beijing subway was finally specified.

Later, with the bad relations between China and the Soviet Union, Khrushchev proposed to withdraw the Soviet experts in China, although the Soviet experts who participated in the construction of the Beijing subway were not withdrawn, but China could no longer get the core technology. At the beginning of 1961, the Beijing subway, which was being planned, was suspended. The Ministry of Railways ordered the abolition of the Beijing Underground Railway Engineering Bureau, and only one underground railway research institute remained. In 63, Soviet experts also left, and when they left, they said that "without the help of foreigners, the Chinese cannot build their own subway." ”

The state leaders attached great importance to the construction of the subway, and formally established the Beijing Underground Railway Preparation Leading Group in January 1965. In the end, the plan of "one ring and two lines" was determined. The "first ring" is built along the inner city wall, which does not disturb the people, and the cost of demolishing the wall is low and fast, so the city wall is extinct. One of the "two lines" was connected to the ring line from the Dongjiao Thermal Power Plant at that time through the Beijing Railway Station, and then went out of Fuxingmen to Shijingshan through Gongzhufen; The other line is from Xizhimen through the Summer Palace and Qinglong Bridge to the northwest mountainous area.

At that time, the construction of the subway was the first in China, and it lacked core technology and experience, so it had to explore it by itself. In order to prevent the atomic bomb explosion, he went to the Harbin Military Engineering Institute and an experimental military base to conduct relevant tests; In order to solve the waterproofing and go to the Navy Submarine R&D Center to inspect, the door of the subway adopts the sealing technology of the submarine.

After more than ten years of debate and practice, China abandoned the deep burial method (60-100 meters) used by the Soviet Union, which had a long construction period and high cost, so it adopted the shallow burial method.

On October 1, 1969, China's first subway locomotive roared out of Gucheng Station. Because it was a war readiness project, the subway was not open to the public at that time, and a letter of introduction was required to ride the train. In the process of operation, the length of the line has also grown, first from Beijing Railway Station to Gongzhufen, and then extended to Yuquan City, the ancient city, and the apple orchard. In March 1971, the construction of the second phase of the Beijing subway began.

However, the Beijing subway was not opened to the public for a long time due to the problem of the power supply system, and it was not until 1982 that the problem of power and fire in the subway was solved by experts.

Although the subway has been built a lot, but the existing subway is affected by the viscosity coefficient of the wheel and rail, the maximum track slope is only two degrees, the track slope is gentle, and a large amount of electric energy is consumed when accelerating, and a lot of kinetic energy is consumed when braking, so the operating cost is very large.

Therefore, Liu Yimiao and the researchers want to develop how to get rid of the limitation of orbital adhesion.

After a long time of discussion and development, we finally made a maglev rail transit. The subway car has also been renovated and fully networked, and you can only swipe the QR code on your mobile phone without having to bring change. Of course, if the bus card is bound to a bank card, then the bus card does not need you to go to the business outlets to recharge.

The speed of the subway reaches 481 km/h, and the construction of the subway does not block the road section, and the use of chute embedding technology greatly saves cost and time.

The first maglev train built was put into trial operation in Beijing, starting from Shimenying Station in the west and Apple Yuan Station in winter.

It was the first time to ride such a fast train, and the scenery outside the window was whizz by, and everyone was very nervous. After getting off the subway, some people were still weak in their legs, but after a while, everyone cheered. After three years of hard work day and night, there is finally a result, how can everyone not be excited.

After the Minister of Railways received the report of completion and opening to traffic, he hurriedly took a ride to experience it, and after the Minister of Railways cut the ribbon, the maglev train was officially opened to the public. CCTV specifically reported on the incident, and the whole world was shocked.

Whether you are a local in Beijing or a foreigner, you must experience such a subway speed when you come to Beijing.

The opening of the maglev train has greatly saved people's travel time and brought a lot of convenience to people's lives.

The subway does not need you to wait in line to check your luggage or something, and there are a lot of access controls at the entrance of the subway station, and as soon as you enter the subway station, it will be automatically scanned, and a warning will be issued if you find dangerous goods, and you will enter stationary. It's hard to do bad things in plain sight, so people consciously abide by it.

"Ding, the host completes the task of convenience for thousands of homes, reward: the latest air conditioning design drawing."

Liu Yimiao knew that she could go home, and she was tired after three years of intense research and development. This time, not only Lei Dajun was waiting in front of the door, but her children and grandchildren were all looking forward to it at the door.

Liu Yimiao was very excited when she saw her relatives and cried happily. Lei Dajun hugged her and patted her, and waited for Liu Yimiao to stabilize before letting go of her.

Liu Yimiao hugged his relatives one by one, and everyone got into the car.

After Liu Yimiao got in the car, he sighed, "Yuanyuan, you are so amazing, you have developed the RV." ”

Yuan Yuan smiled and said, "This RV is fully functional, and there is not much breakthrough in technology, and it is not as good as you." ”

Liu Yimiao said, "It's good to have ideas, there is no need to compare." You're all good boys. In order to pick me up today, the children have taken time off. ”

Kang Kang said, "No matter how busy you are, I haven't seen you for three years, I said why do you have to keep it so secret, it turns out that you have made such a big initiative, it's really amazing." Mom, we're all so proud of you. ”

Liu Yimiao waved his hand, "I'm just a soy sauce maker, mainly the R&D personnel inside." ”

The crowd laughed and said nothing.