begins on the same route as the Northern Line, splitting at Ban Phachi Junction towards Nakhon Ratchasima. Then at Thanon Chira Junction, the line splits with one route passing Khon Kaen and Udon Thani before terminating at Nong Khai 624 kilometers from Bangkok. The other route passes through Buriram, Surin, Sisaket to reach Ubon Ratchathani, 575 km from Bangkok. There is also another branch route originating from Kaeng Khoi Junction in Saraburi Province passing through Chai Badan District in Lopburi Province and Chatturat District in Chaiyaphum Province, before joining the mainline heading towards Nong Khai at Bua Yai Junction in Nakhon Ratchasima Province. Saraburi Station - Main Saraburi station, named Pak Priaw station until 1934. Kaeng Khoi Junction - The Bua Yai Line and Khlong Sip Kao line diverge from the mainline here. Main Depot with refuelling facility. The point for dividing freight trains into two trains to pass difficult section of Dong Phraya Yen (Kaeng Khoi - Pak Chong) or combining divided freight trains into one train Pak Chong Station - The gateway to Nakhon Ratchasima and the point for dividing freight trains into two to pass difficult section of Dong Phraya Yen (Kaeng Khoi - Pak Chong) or combining divided freight trains into one train Nakhon Ratchasima Station - Main depot of the Northeastern Line with refuelling facility and a branch line to 2nd Army Support Command. Main Nakhon Ratchasima station. Thanon Chira Junction - Junction for Nong Khai line close to Fort Suranaree (2nd Army Region HQ) Buriram Station - Buriram provincial station with a branch line to a quarry at Khao Kradong Surin Station - Main Surin station Sisaket Station - Main Sisaket station. Ubon Ratchathani Station in town of Warin Chamrap - Terminus of South Isaan Line (also known as Ubon Line) with depot and refuelling facility. Named Varindr station until 1942-1943. Main Ubon Ratchathani Station. Lam Narai Station- Station on the Lam Narai/Bua Yai Branch, for Chai Badan Municipality. Chatturat Station- Station on the Lam Narai/Bua Yai Branch, alight for Chaiyaphum. Bua Yai Junction - junction with refuelling facility Khon Kaen Station - Khon Kaen main station Udon Thani Station - Udon Thani main station with refuelling facility. Nong Khai Station in town of Nong Khai - Terminus of North Isaan Line (also known as Nong Khai Line), provides a connection to Thanaleng Station in Vientiane Prefecture, Laos. Main Nong Khai station. Southern Line