Explosions at a railway in Thailand's southern Songkhla province killed at least three people and injured four others, local media reported on Tuesday.The explosions hit a section of the railway where workers were doing repair work, according to local media Daily News.The section of the railway was hit by a blast during the weekend, which derailed a freight train.Explosions at a railway in Thailand's southern Songkhla province killed at least three people and injured four others, local media reported on Tuesday.The explosions hit a section of the railway where workers were doing repair work, according to local media Daily News.The section of the railway was hit by a blast during the weekend, which derailed a freight train.