China will overhaul its train numbering system to accommodate the expansion of its railway network, changing the meaning of several familiar letter prefixes while keeping routes and schedules unchanged under the current timetable.
The changes, to be introduced in late November and late December, will increase the number of available train numbers for bullet train services by nearly 40 percent, China State Railway Group, the national railway operator, said on Friday.
For travelers, including international visitors, the key change is that letters long associated with one type of train will identify another.
T and K, previously used for regular speed express and fast trains, will identify high-speed services with top operating speeds of 300 kilometers per hour and 200 to 250 km/h, respectively. G will identify Fuxing trains with a maximum operating speed of 350 km/h.
The X prefix will be reserved for Fuxing trains operating above 350 km/h. However, no X series passenger services will begin operating in this round of changes, said Xu Yan, deputy director of the operator's passenger transport center.
The overhaul follows substantial growth in railway services. Between 2014 and 2025, China's railway network expanded from 112,000 kilometers to 165,000 km, while the average number of passenger trains operating daily rose from 4,894 to 11,796.
"During peak travel periods such as the May Day and National Day holidays, G series services use more than 90 percent of the available train numbers for that prefix," said Fan Mingxiang, deputy director of the operator's transport department.
Wei Yuguang, a professor at Beijing Jiaotong University, said train numbers serve purposes far beyond helping passengers find their trains.
"They are a common language for coordination across regions and departments," he said, explaining that each train's unique number is a basic unit for organizing transport, dispatching, passenger services and accounting.
Even the length of a number matters.
"Using three digits or four may mean just one extra word each time for a dispatcher, but repeated throughout the day, it adds considerably to the workload," Wei said.
Pronunciation also needs to be considered. "If two train numbers sound very similar, that can cause problems in dispatching," he said.
Wei said the new system builds on existing rules while making room for more trains and new services. It must accommodate both passenger and freight trains, including those operating across borders.
Cross-border passenger services will also have their train numbers adjusted on domestic sections of their routes under the revised rules, the operator said.
Regular speed passenger trains, tourist trains and some freight services will have their numbers changed in late November, followed by high-speed and other services in late December.
The new train numbers will appear on 12306, China's official railway booking platform, when tickets go on sale, up to 15 days before departure. Onboard services, including quiet carriages and online meal ordering, will remain unchanged.
For international visitors who rely on travel guides to plan their trips, older explanations of train prefixes may no longer apply after the changes. The operator urged passengers to check train numbers, departure and arrival stations, and schedules carefully.
Editor：Zhou Jinmiao
