China has announced the completion of a world-first railway test: seven freight trains, each weighing 5,000 tons, ran on the same line in a compact formation without being connected by mechanical couplings, synchronizing their acceleration and braking exclusively through an intelligent wireless control system. The test, conducted on the Baoshen railway in Inner Mongolia, reached a total mass of 35,000 tons — the equivalent of more than “three Eiffel Towers.”
According to CCTV, this is the first time that multiple heavy freight trains have run as a “virtual convoy,” coordinated in real time only by radio signals and advanced algorithms. The system was developed by China Shenhua, part of the China Energy Investment Corporation energy group, together with research institutes and industrial partners.
How does “virtual coupling” work?
The key to the experiment was for all seven trains to accelerate and brake in perfect synchronization, maintaining safe distances without the risk of collisions or breaking formation. Traditionally, freight trains run as single units, mechanically coupled — wirelessly “linking” seven separate trains is a significant technological challenge.
The system uses a “two-dimensional” control model:
- relative speed between trains,
- absolute distance from points on the line,
transmitted and processed in real time. Two-way communication between trains and ground infrastructure allows for highly precise coordination of movements.
A solution for increasing capacity without new lines
CCTV and the Chinese technical press note that this technology could increase freight line capacity by more than 50% without major infrastructure investment.
On routes such as Baoshen — a strategic corridor for coal transport between the Shenmu and Ordos regions — a wireless convoy would allow multiple trains to operate in the same time slot with greater safety and energy efficiency.
An expert quoted by the Chinese press says that the technology could later be adapted for high-speed trains, urban transport, or conventional lines, providing a model for the digitization of railway control.
Dynamic grouping and automatic separation
During the test, trains — located at different stations on the Baoshen line — were gradually connected into a single “virtual train.”
The trains ran in close formation to Wanshuiquan South, where they automatically separated and entered the station separately, maintaining wireless control until the end of the maneuvers.
Potential international impact
China is presenting this achievement as a possible “technological model” for countries that want to improve the efficiency of long-distance heavy freight rail transport without the high costs of building new lines.
For now, the technology is in the testing phase, but the success of the first operation indicates that the “virtual convoy” model could become a viable solution for heavy-tonnage rail transport.
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