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China releases prototypes of world's fastest high-speed trainBy Li Xinping (People's Daily) 13:31, January 03, 2025
Prototypes of the CR450 bullet train, the world's fastest high-speed train with a test speed of up to 450 kilometers per hour (km/h) and an operational speed of 400 km/h, were debuted in Beijing on Dec. 29, 2024.
The CR450 is significantly faster than the CR400 Fuxing high-speed trains currently in service, which operate at speeds of 350 km/h. Here are the secrets behind the higher speed.
Photo shows a prototype of the CR450 bullet train. (Photo from the WeChat official account of CRRC Corporation Limited)
Stronger Power
High-speed rail runs fast because it converts electrical energy into mechanical energy. The CR450, utilizing permanent magnet traction motors, has increased energy conversion efficiency by over 3 percent compared to the CR400, which uses asynchronous traction motors. The stronger power output enables the train to run faster.
Lower Resistance
As high-speed trains accelerate, aerodynamic resistance escalates exponentially with the velocity. When the speed rises to 400 km/h, the resistance will increase by 30 percent. This means that most of the energy generated by traction motors is expended in combating air resistance. With an innovative design, the CR450 has managed to slash operational resistance by 22 percent.
Lighter Weight
A lighter weight is crucial for high-speed trains. The CR450 has cut its weight by over 10 percent compared to the CR400, thanks to the adoption of new materials such as carbon fiber composites and magnesium alloys, as well as the topology optimization technique.
Better Performance
Apart from high speed, it is more important for bullet trains to have efficient braking. The CR450 now takes only 6,500 meters to achieve a complete stop from 400 km/h, the same braking distance as the CR400.
This outstanding performance has allowed the CR450 to reach a higher speed without increasing energy consumption. When running at 400 km/h, the eight-carriage CR450 consumes only 22 to 23 kilowatt-hours of electricity per kilometer, making it a cost-effective and eco-friendly choice for commercial operations.
The CR450 high-speed train also boasts many eye-catching designs.
More Intelligent
The CR450 is equipped with intelligent monitoring and diagnostic systems, which allow the train to collect data such as axle temperature and pressure from over 4,000 monitoring stations in real time. This advanced technology has enabled the train to recognize, assess and determine its actions by itself.
Photo shows a prototype of the CR450 bullet train. (Photo from the WeChat official account of CRRC Corporation Limited)
Besides, the CR450 has innovatively adopted time-sensitive network transmission signals, leading to a ten-fold increase in the efficiency of real-time data transmission. This has facilitated the communication among different systems on the train and enhanced the control precision.
Quieter Operation
The passengers' level of comfort is greatly influenced by noise levels, which typically rise by two to three decibels for every 50 km/h increase in speed. The CR450 has managed to reduce its in-cabin noise by two decibels, making the overall noise level comparable to that of the high-speed trains currently in service, which operate at 350 km/h.
More Comfortable
The height of the CR450 has been trimmed from 4.05 meters to 3.85 meters to make the train more slender. Even with the reduction in the overall height, the height of the interior cabin remains unchanged. Thanks to this compact design, the CR450 offers 4 percent more room for passengers and has expanded the storage capacity for large luggage by 100 percent.
More functions
The CR450 is designed with adaptive lighting that can adjust brightness according to the outdoor environment, touchless restrooms with "airborne buttons," and additional options like family compartments and multi-functional spaces.
"We are committed to providing passengers with diverse, convenient, and personalized services to enhance their travel experience," said Ren Guangqiang, an executive with the Locomotive & Car Department of China Railway.
The CR450's development represents China's venture into new and unexplored aspects of the high-speed train industry.
Photo shows a driving cabin within a CR450 bullet train prototype. (Photo from the WeChat official account of CRRC Corporation Limited)
China Railway launched research on basic theories and key technologies for high-speed trains operating at 400 km/h in 2018, followed by the beginning of development efforts in 2021.
