With a total length of about 23 kilometers, the 4-3 section built by CAN joint venture led by CSCEC consists of the box girder and foundation of the elevated railway, building facilities of the electric train system, the drainage system, the railroad removal tracks and other public facilities and roads.

It is the flagship project of the high-quality Belt and Road cooperation jointly built by China and Thailand, and the first high-speed railway in Thailand. The railway starts from Bangkok, Thailand in the south and connects with China-Laos railway in the north. When completed, it will greatly enhance regional connectivity and promote Thailand's infrastructure construction and economic and social development.