Should the maximum operating speed of high speed EMUs be restored to 350 km h?

China's high-speed rail is now running at a maximum speed of 300 km/h, so can it return to a maximum speed of 350 km/h? Can the speed of a high-speed train be increased?

Industry insiders believe that whether the high-speed rail train runs 350 depends on the technical conditions, as well as the relationship between railway operating costs and social wealth creation, time saving and cost savings. Speed can be considered if the growth in energy consumption is less than the wealth created, or if the cost of time is reduced to economical.

In view of the concerns of society, the common response of experts is that at present, China's high-speed railways are strong in hardware and software, and there is little problem in "re-running" to a maximum speed of 350 kilometers per hour. The market demand for Beijing, Shanghai, Beijing, Guangzhou, Shanghai-Kunming and some intercity high-speed railways is strong, and some medium and long-term passengers are also looking forward to speeding up.

After the 2011 Ningbo-Wenzhou Line 723 accident, the maximum speed of the high-speed rail was downgraded. The president of the Fourth Survey and Design Institute of China Railway said that at the technical level, the high-speed rail train is designed at a speed of 350 kilometers per hour, with a speed of 350 kilometers per hour and 300 kilometers per hour, and the technical requirements for turning radius and slope are the same.

According to the reporter's understanding, at present, the maximum speed limit of high-speed railway is only 300 kilometers (the actual maximum speed is 300 to 310 kilometers per hour). There are safety considerations, but the main reason is mainly based on operating costs and maintenance costs.

Recovery to 350 km can start with heavy-duty rail transportation of heavy and high-tech classes. That is to say, in the case of the speed increase of the relevant main line, different operating intervals, different times, can run different maximum speeds. If Beijing and Shanghai go south from Tianjin to Jinan, the speed from Xuzhou to Bengbu is 350 kilometers per hour, while Jinan to Xuzhou can run 320 kilometers per hour.

Some vehicles have short running times and a lot of stops, so you can consider maintaining your current driving speed.

Some of the experts interviewed believe that on the basis of safety and economic principles, part of the high-speed rail line is ready to explore and restore a maximum speed of 350 kilometers. At the specific operational level, it is suitable for "classification policy", scientific planning, and steady progress.

Technically

Lines and trains are designed to be redundant, at least at 110% of the maximum operating speed. The existing multi-index "turning radius, ultra-high, line spacing, dojo, catenary, signal system" can run at a speed of up to 350 km h, and the long-term operating speed overhaul and loss factor are highly professional and even require the accumulation of data. The same is true for multiple indicators of existing EMUs.

All these lines and locomotives have experienced 350 km/h and 300 kmh for several years, accumulating a wealth of data, what kind of speed was chosen, and from these data, a good mathematical model should be built for analysis, and not here to enter arguments.

From the run

That is, the operation of the line under different speed economic conditions is also an indispensable factor, and the Beijing-Shanghai high-speed railway is a profitable operation "excluding the cost of high-speed railway construction". There will also be a lot of things, such as low speed and low power, but the run time will also increase, so the minimum power consumption should be within a certain speed range. Of course, we are not always looking for lower energy consumption, if the line passenger volume and passenger turnover have been maintained at this speed range can withstand a higher level, so it should also be accelerated, the speed of operating costs, of course, should also be reflected in the ticket, in order to achieve a reasonable level of operation.

We need to understand what's new in the development of railways

Far beyond high-speed rail, passenger and freight programs, freight heavy-haul, quasi-high-speed passenger locomotives and coaches. The Great Leap Forward is very high, and it is really necessary to build a world-class railway. But does he have a lot of shortcomings?

The rapid development of railways is accompanied by the status of railway workers. He also did not have a great influence on the main forces of the department, so the continuity of policy was significantly reduced, and so on. There is no need to exaggerate.

EMU... It depends on which model... Like the cit500 that is still in the experimental stage, the speed has reached more than 600, and there are things like crh380, crh2c, crh3c, etc., are different...

If you want to say the fastest, it is the cit500 [also called CRH500] that is still in the experimental stage mentioned earlier

If calculated according to the test speed, the maximum is now CIT500 605 km h

The rest should be CRH380D, followed by other 380 series......

EMU speed 430 * (1-75%) = 430 * 25% = 430 4 = 215 2 km h.

On October 27, at the roundtable meeting of the 14th China International Modern Railway Technology and Equipment Exhibition, Wang Jun, vice president of CRRC, expressed his opinion that with the current mechanical theory of rail transit wheel-rail traction,**In the future, it can achieve a speed of 400-500 kilometers per hour, and 500-1000 km/h, which is the operating speed that can only be formed under the impetus of magnetic force.

Wang Jun said that the current rail mode of transportation mainly relies on mechanical force or friction, through wheel-rail traction, "the mechanical theory of this technology has developed to this day, how far can we go, I think, (is the speed) 400-500 kilometers per hour,."At the moment we have achieved a run of 350 kilometers per hour. ”

As for the faster operating speed, Wang Jun said, "(speed) 500-1000 kilometers per hour, I personally believe that it is a mode of transportation formed under the impetus of magnetic force, such as the (speed) 600 kilometers per hour ultra-high-speed maglev that we are developing now." He believes that the development of higher-speed transportation modes will use materials such as low-temperature superconductivity and high-temperature superconductivity, which will bring about the development and change of a series of technologies such as superconducting materials.

When it comes to transportation modes with a speed of more than 1,000 kilometers per hour, Wang Jun said that this speed will mainly focus on the aerodynamic problems brought about by supersonic conditions.

Wang Jun also mentioned his views on the development of future equipment technology, rail transit technology and transportation technology.

He believes that at the moment judging by the speed that can be achieved by wheel-rail technologyChina has developed high-speed railways to a speed of 350 kilometers per hour, and will operate at a speed of 350 kilometers per hour for a long time in the future.

In terms of paying attention to future technology, he believes that it is necessary to pay attention to the improvement of the comprehensive economy of equipment, and consider energy conservation and technological development to form a strong support for it. It is necessary to realize the high efficiency of energy transmission and implement efficient management of energy.

He said that in the future, equipment technology should achieve four goals: first, improve comprehensive economic benefits and reduce costs; The second is to establish an environmentally friendly mode of transportation to achieve noise reduction, shock absorption, etc., such as aerodynamic noise, aerodynamic resistance, electromagnetic radiation, electromagnetic noise and a series of reductions; The third is to be green and sustainable, so that passengers are in a safe and green environment, and ensure air quality, light source quality, product availability and renewable; Fourth, it is necessary to achieve safe, reliable and sustainable operations.

The development of future technologies, such as big data, the Internet of Things, digitalization, artificial intelligence, etc., can bring solutions to existing problems. For example, Wang Jun said that in order to improve the operational safety and reliability of the whole life cycle of vehicles, the research work on vehicle fault management and health management (PHM) is now being carried out, coupled with the development and application of intelligent manufacturing, intelligent vehicles, unmanned driving and other technologies, which will further improve the safety and reliability of vehicles and reduce operating costs.

China's high-speed rail is attracting the attention of the world!

It can run for a long time, but the probability of an accident is high.

The current Beijing-Shanghai, Beijing-Guangzhou, Harbin-Dalian and other high-speed railways are all designed according to the 350km h standard.

The same is true for the Beijing-Shenyang high-speed railway, which has already begun construction.

At present, the reason why the maximum speed is 300km h is completely due to the inaction of the former Ministry of Railways, and in order to ensure the safety of driving, the speed reduction measures are artificially imposed.

With the continuous standardization of technology, organization and management, the standard driving speed will definitely be restored.

But it definitely needs a process, and it's hard to say how long the process will be, maybe 3 years, maybe more than ten or twenty years.

I think it should be restored. It was originally designed to be 350,

It's technology moving forward!