Post COVID asean saw its first hsr in the form of Jakarta Bandung hsr in Indonesia opened in 2023.
Laos on the other hand started its medium speed rail from Vientiane to kunming in 2022. One can travel across Laos within 4 hrs. That’s quite a major revolution.
All the above projects come about due to China. Next train project coming online is ecrl from Kl to Kota baru and bkk to Nakhon ratchasima hsr sometime between 2027 -2030.
China is also busy extending it medium speed rail 250kmh from kunming to hekou and nanning to pinxiang. Both lines will connect to Vietnam. It will just take ard 2 hrs to reach the border of Vietnam once this train is up. The border train to Vietnam was open in 2024 between Nanning to dongxing. Travel time is 70 minutes.
From there on it will depend on the respective asean countries how will they want to enhance their connectivity to China