Eastern Line is a railway line in Thailand, built and owned by State Railway of Thailand (SRT), located in Bangkok, Chachoengsao Province, Nakhon Nayok Province, Saraburi Province, Prachinburi Province, Sa Kaeo Province, Chonburi Province, and Rayong Province. It is the most important freight transport line in Thailand because there are many freight trains on the line. It was opened on 24 January 1907. There are plans to incorporate the line as part of the eastern branch line on the Kunming–Singapore railway.