On February 22, 2019, China's first variable-form group of EMUs completed all of the more than 60 in-plant tests, and passed the unique variable group verification to have the factory conditions. Previously, the EMU had applied for nearly 80 patents and won the China Excellent Industrial Design Award and the China Design Intelligence Award. Since the birth of high-speed EMUs for more than half a century, relatively fixed grouping methods have been adopted. There are passenger flow in the railway season, and the difference between the Spring Festival and the daily life is huge. Fixed marshalling EMUs cannot be dismantled, and can not increase the passenger car to meet the peak passenger flow, nor can it reduce the car to reduce expenditure or avoid waste of transportation capacity. Passenger flow and transportation capacity often form bottlenecks. The variable-formed EMUs that are now unveiled have been praised by fans as “Transformers” in the EMU.

In the new model of the variable group EMU, the double-deck second-class car, the double-decker VIP car, the double-decker meal and the passenger-cargo car are all double-layered. The minimum grouping unit of the variable group EMU is two sections, that is, two power head cars are connected. In the face of changes in passenger flow, if you want to expand the grouping, you can calculate the optimal matching according to speed and power. You can change the matching train and trailer car in the range of 2 to 16 knots, and quickly customize the speed class, group number and seat configuration. EMU trains are as flexible as 'building blocks'.

For areas with large passenger traffic, double-decker, long-form, and large-capacity EMUs can be used; in economically developed areas, short-form trains with comfortable and large spaces can be used; in areas with low passenger traffic, short-form trains can be used. Through its own "seventy-two changes", the variable group EMU can flexibly respond to passenger flow fluctuations and passenger demand, significantly improve the cost performance and practicality of EMU trains, and comply with people's longing for a beautiful travel life. In the train, you can experience the new design concept of “smart and smart”, “completely complete”, “renewed” and “economical comfort”.

Based on the intelligent network control system of the EMU, the group configuration can be automatically recognized when changing the matching car. Passengers can enjoy the functions of large-sized luggage intelligent storage, smart ordering, etc., while achieving full-line WiFi network coverage, sleeper passengers can Adjust the lighting and film system according to your needs... greatly improve the comfort of passengers.

The capacity of the vertical sleeper, double-deck and commercial vehicles of Dacheng is 50%, 33% and 70% higher than that of the conventional high-speed EMU, which can increase the fare floating space in the off-season and greatly increase the capacity during the peak season. The peak of passenger flow. At the same time, the variable marshalling EMU has also added independent warehouses under the food and passenger and cargo combined vehicles, which can realize the functions of small insulation, refrigerated containers, express shipments and fast delivery, and fill the blank of EMU freight. The logistics industry such as product transportation, medical and health emergency has far-reaching impact.

The industrial platform's variable-formed EMUs provide more options for the HSR to further optimize passenger travel conditions. The R&D team practices the concept of deep integration of industrial design and manufacturing. It breaks through key technologies such as traction power system integration, network control, and vehicle end connection. It uses modular, integrated, and unitized design to break the high-speed train fixed grouping mode. The equipment, functions and structure of the EMU were redesigned and defined, and a double-deck car, a large-size vertical sleeper car, a horizontal VIP car, a business car, a seat-converted sleeper car, a meal and a passenger-cargo car were developed. New model.