August 2023 Contract 3-2 Railway tunnels at Muak Lek and Lam Takhong
Progress as of 25 August 2023: 35.32%
The Cooperation between the Government of the Kingdom of Thailand and the Government of the People's Republic of China on Bangkok–Nong Khai HSR Development for Regional Connectivity (Section 1: Bangkok–Nakhon Ratchasima)