Government spokesman Yongyuth Mayalarp said Tuesday that Prayut had been invited by the Chinese leader.
The agreement is expected to be inked by Transport Minister Prajin Juntong and the president of China’s National Development and Reform Commission.
After that a joint task force would be set up and a Chinese team sent to Thailand to conduct the feasibility study.
Construction is expected to commence in 2016 on two standard-gauge parallel railways –the 734-kilometre Nong Khai-Korat-Kaeng Khoi-Map Ta Phut Port line and the 133km Kaeng Khoi-Bangkok line.
The project is part of Thailand’s infrastructure development plan for 2015-22.