Officers from Khao Yoi Police Station collected the body of a 21-year-old woman who was driving the car, and took the two male passengers who were seriously injured to hospital.
Initial investigation showed that the victims worked at a factory in Samut Songkhram province and had gone to Khao Yoi district for a meal.
They were heading home when they got hit by a train while crossing a railway track.
Five days ago, a train hit a bus killing 18 people, which sparked criticism over the safety of Thailand’s railway system.