The Project on Bangkok–Nong Khai HSR Development is a strategic project regarding ASEAN regional connectivity to develop a linkage route between Thailand and other countries both regionally and globally in congruence with the Belt and Road Initiative (BRI) by the government of the People’s Republic of China.

On 11 July 2017, the Thai Cabinet approved the State Railway of Thailand (SRT) to execute the Project on Bangkok–Nong Khai HSR Development for Regional Connectivity (Section 1: Bangkok–Nakhon Ratchasima). The project is an international joint development at the government level between Thailand and China. In this regard, the Thai government is responsible for entire project investment, civil works construction, and application of Chinese construction technologies and railway systems. The project commencement ceremony was held on 21 December 2017. With a total budget of 179,412.21 million baht, the project is now under construction and is expected to start operation in 2027.

The route of Thai–Chinese HSR (Section 1: Bangkok–Nakhon Ratchasima) is 250.77 kilometers in a total distance, divided into:

1. Elevated route: 188.68 kilometers
2. At-grade route: 54.09 kilometers
3. Tunnels: 8 kilometers (totaling two tunnels, one in Muak Lek District and the other at Lam Takong Reservoir)

The project consists of six stations, which are:

1. Krung Thep Aphiwat Central Terminal
2. Don Mueang Station
3. Ayutthaya Station
4. Saraburi Station
5. Pak Chong Station
6. Nakhon Ratchasima Station