| Ubon Ratchathani Main Line | |
|---|---|
| Overview | |
| Type | Inter-city rail |
| System | Northeastern Line |
| Status | Operational |
| Locale | Bangkok, Pathum Thani Province, Phra Nakhon Si Ayutthaya Province, Saraburi Province, Nakhon Ratchasima Province, Buriram Province, Surin Province, Sisaket Province, and Ubon Ratchathani Province |
| Termini |
Hua Lamphong Ubon Ratchathani |
| Operation | |
| Opened | 26 March 1896 |
| Owner | State Railway of Thailand |
| Operator(s) | State Railway of Thailand |
| Depot(s) | Bang Sue Depot, Kaeng Khoi Depot, Nakhon Ratchasima Depot, and Ubon Ratchathani Depot |
| Technical | |
| Line length | 575.10 km (357.35 mi) |
| Track gauge | 1,000 mm (3 ft 3 3⁄8 in) metre gauge |
Ubon Ratchathani Main Line or Lower Isan Line is a railway line in Thailand. It runs from Hua Lamphong Railway Station in the central to Ubon Ratchathani Railway Station in the lower northeastern, passes many provinces.