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Pictured: empty rail operation effect diagram

When you are stuck in a traffic jam in a noisy city, will you be surprised when a hanging train suddenly passes overhead? Yes, this is a new type of rail transit-suspended monorail train, also known as empty rail or air train. The reporter was informed on June 15 that China Railway Science and Industry Group, a central enterprise in Han Dynasty, is developing and producing an empty track test line in Jiangxia District, which is expected to be put into trial operation during the year.

Entering the Jiangxia production base of China Railway Science and Technology Corporation, a train of two carriages, which looks like a subway, comes into view, and the four characters "New Times" on the car body are particularly eye-catching. More than 10 workers are working, and the main body of the car has been basically completed. The design of the carriage is similar to that of the subway carriage, but smaller and more exquisite. A single car is 11 meters long (22 meters in the subway) and 2.4 meters wide (2.8 meters in the subway), which can accommodate 80 to 90 people at the same time, accounting for about one-third of the capacity of a single car in the subway. About 500 meters away from the empty rail, a test line about 1 km long is under construction.

It is reported that China is the third country to master the technology of empty orbit after German and Japanese. In 2018, China Railway Science and Technology began to build a test line about 1 km long at Jiangxia Base, and plans to try it out in 2019.

Wang Yinglin, dean of China Railway Science and Technology New Track Research Institute, said that the track of the empty track is above the train, and the train runs on the track beam, with a speed of 70 kilometers per hour. The carriages are generally 3 to 5 knots, with a traffic volume of 300 to 400 people per trip, with an hourly passenger flow of 10,000 passengers, mainly serving the passenger transportation in the suburbs of big cities, medium-sized cities and tourist attractions. Compared with subway, light rail, tram and other rail transit, it has obvious advantages and is especially suitable for tourist attractions.

In 2018, the National Development and Reform Commission issued the Opinions on Further Strengthening the Planning and Construction of Urban Rail Transit, which raised the threshold for subway construction. For example, the government debt ratio of the declared city in the past three years should not be higher than 120%, the local general public finance budget revenue should be more than 30 billion yuan, the regional GDP should be more than 300 billion yuan, and the urban resident population should be more than 3 million. "The cost per kilometer of the empty rail is at least half lower than that of the subway, which is very attractive to the remote city of Wuhan and medium-sized cities such as Xiangyang, Yichang and Jingzhou." Wang Yinglin said that the construction cost of the empty track is low, and the carrying capacity of more than 10,000 passengers per hour can basically meet the transportation needs of cities with a permanent population of 1 million to 3 million, with high cost performance.

Secondly, the empty track develops upward, and columns are built by using flower beds and isolation belts in the middle of the road, which will not squeeze the urban roads and avoid traffic accidents like trams colliding with vehicles and pedestrians. The occupied area is small, and the columns can be removed and reused, which can alleviate the problem of urban congestion.

In addition, the climbing ability of the empty rail is three times that of the subway, and the turning radius is 50 meters, which is only half of that of the subway, greatly reducing the cost of urban demolition.

According to industry insiders, at present, Leshan in Sichuan, Hanzhong in Shaanxi and Hancheng have put forward the idea of building empty tracks. At the beginning of 2018, a suspended empty rail experimental line was built in Qingdao. With the diversification of rail transit construction mode, it is expected that empty rail will be put into use in China soon.