Who knows how fast the train is?

The French high-speed train reached a speed of 574.8km/h in the driving test on April 3, breaking the world record of 5 15.3km/h set by the French high-speed train in 1990. While people are cheering, there are more questions: when will this latest world record be broken again, and how fast can the train run?

I feel very stable sitting inside.

This record-breaking test train was named "V 150", which means to achieve the goal of running at a speed exceeding 150 meters per second, that is, 540 kilometers per hour. The train "V 150" leaves on the 3rd 13 local time, 264 kilometers away from the newly-built Paris-Strasbourg East Railway. After 10 minutes, the train first reached the speed of 5 15.4 kilometers per hour, breaking the world record of 17 years held by French high-speed trains. After driving 73 kilometers, the train speed reached 574.8 kilometers per hour. This speed is comparable to that of a short-range propeller cargo plane.

The special correspondent of Global Times experienced on the "V 150" train that when the train speed exceeded 500 kilometers per hour, the car body was very stable and the noise did not increase significantly. A spokesman for the French national railway company told reporters on the same train after the train set a record that today's test results were more than 30 kilometers faster than the target speed, which fully demonstrated the strength of French railway transportation.

Experts from Alstom Company who participated in train manufacturing told reporters that to achieve such a high speed, the requirements for trains, rails, subgrade and power supply system are very high. The "V 150" train was specially developed for this test. The total length of the train is106m, with a weight of 268 tons. It consists of two traction locomotives and three carriages. Compared with the trains currently operated by the French high-speed railway, the wheel diameter of this kind of train is increased from 920mm to 1092mm to ensure that each rotation covers a longer distance. Traction has also doubled. In addition to the train itself, the rails are specially treated to ensure complete contact with the wheels. The transmission line supplying power to the train also increased the voltage from 25,000 volts to 3 10000 volts. The railway from Paris to eastern France has not yet been put into commercial operation and is expected to be officially opened to traffic in June this year.

The fastest speed 1.35 million kilometers.

So, how fast can the train run? A railway expert from Beijing Jiaotong University said in an interview with the Global Times reporter that according to theoretical calculation, the train speed can reach 22,500 kilometers per hour, but considering the physiological and psychological limits that passengers can bear when accelerating or decelerating the train, the acceleration of the train must be controlled before it can be accepted by people. In the case of control, the train speed should theoretically reach 1.350 km.

Experts say that the operating speed of traditional wheel-rail railways is 300 -350 kilometers per hour. On this basis, if we want to further improve the speed, it will be limited by wheel-rail friction. It is not a simple matter to realize the theoretical assumption in real life, because there are many factors such as aerodynamics, resistance, wheel-rail relationship, noise and so on. The stability and safety of high-speed railway are all factors that cause the railway to fail to reach the theoretical speed.

Experts believe that the traditional wheel-rail system is unable to make the train run continuously at such a high speed. This is because the current train relies on the wheels to roll on the rails, which produces adhesion to make the train move forward. Due to the influence of frictional resistance, the speed is limited. According to researchers' calculations, the top speed of ordinary wheel-rail trains is about 350-400 kilometers per hour. If noise, vibration, wheel and rail wear and other factors are taken into account, the actual speed cannot reach the maximum speed. Therefore, many countries have turned their attention to the new technology, that is, the unconventional train-maglev train. The current record of maglev train was set in Japan in 2003, with a speed of 58 1 km. However, the maglev train uses electromagnetic force to make the vehicle float and run completely off the track, so this record does not prevent France from hitting the world record of the train running on the track.

France, Germany and Japan are the best.

Internationally, it is generally believed that high-speed railway refers to the passenger dedicated line running at a speed of more than 200 kilometers per hour, which can be divided into wheel-rail type and magnetic levitation type according to the principle of train support and propulsion. At present, most of the high-speed railways put into commercial operation in the world are wheel-rail type. There are three countries with the most developed high-speed railway technology in the world: Germany, Japan and France. 1964, Japan built the world's first high-speed railway, Tokaido Shinkansen, with a speed of 2 10 km/h. 1996 the Japanese shinkansen set a record of 443 kilometers per hour. 198 1 year, France built the French version of TGV, with a top speed of 270 kilometers per hour. Later, TGV of France developed other lines with a top speed of 300-320 km/h, and set a world record of 1990 of 5 15.3km/h on the Atlantic line in May, which was only broken by France at this time. Germany's ICE is the latest project of high-speed railway at present, and its current top speed is 65,438+409 kilometers set in 0988.