The Bangkok–Nong Khai high-speed railway or Northeastern high-speed rail line is a high-speed railway under construction in Thailand. It is the first high-speed line in Thailand. Its first phase, between Bangkok and Nakhon Ratchasima, is could open in 2026. As of September 2021, the entire route is expected to be operational by 2028, while the first section, from Bangkok to Nakhon Ratchasima, could be in service by 2026. The railway has been envisioned as part of a Kunming–Singapore railway Central section.