Abstract: Statistical analysis is conducted on railway tunnel projects, high-speed railway tunnels, and extra-long railway
tunnels in China by the end of 2022. It is shown that: (1) The operating mileage of railway has reached 155 000 km in
China. To be specific, 17 873 railway tunnels have been put into operation, with a total length of 21 978 km. (2) The
total length of high-speed railways that have been put into operation in China has exceeded 42 000 km, and up to 4 178
tunnels with a total length of 7 032 km have been built for high-speed railways. Among them, 105 are extra-long tunnels
for high-speed railways with a length of more than 10 km each and a total length of about 1 339 km. (3) 259 extra-long
railway tunnels have been put into operation in China, with a total length of about 3 498 km. Among them, there are 12
extra-long railway tunnels over 20 km each, with a total length of about 283 km. Finally, the key projects newly put into
operation in 2022, namely Dali-Baoshan section of Dali-Ruili railway, Hubei-Chongqing section of Zhengzhou-Wanzhou
railway, and Emei-Mianning section of New Chengdu-Kunming railway, and their characteristics are briefly introduced.
The construction technologies and experiences form a suit of full-process, full-geology, and full-face mechanized design
and construction technology through application of the Zhengzhou-Wanzhou railway tunnel; the successful construction
of the Dali-Baoshan section of the Dali-Ruili railway and extra-long New Chengdu-Kunming railway has laid a solid
foundation for the construction of long-and-large tunnels located in complex mountainous areas. The successful
construction of these projects has laid a good foundation for the information-based, mechanized, and intelligent
construction of railway tunnels, laid a solid foundation for the construction of high-speed railways in complex and
dangerous mountainous areas, and demonstrated the progress of tunnel construction technology in China under special
and complex geological conditions.