The train was derailed and its last car was badly damaged in the incident. The local train was leaving Sungai Kolok |district in Narathiwat and heading for Hat Yai in Songkhla province when the bomb exploded.
The explosion took place shortly before 6pm.
No passengers were hurt. Chaowalit Khongpan, a State Railway of Thailand worker travelling in the last carriage, was killed. Amnuey Mapae, the station master, was injured.