
The train was derailed and its last car was badly damaged in the incident involving the local train leaving Sungai Kolok in Narathiwat and heading for Hat Yai in Songkhla.
The explosion took place shortly before 6 pm Saturday. No passengers were injured.
Chaowalit Khongpan, a State Railway of Thailand worker who was on the last car at the time of explosion, was killed in the blast. Amnuey Mapae, a stationmaster, was injured in the incident.