A north-bound passenger train rear-ended another on tracks in Ayutthaya province late Thursday, injuring more than 20 people, authorities said.
The cause of the collision was not immediately clear. The State Railway of Thailand (SRT) posted a statement on their Facebook page with bare details of the incident.
Pol Col Nateepat Thammaratsophon put the number of injuries at 22. He described most of the injuries as minor but said two people were in critical condition - a train driver and a mechanic. As of 6am, some injured passengers were discharged from the hospital.
Most of the passengers were uninjured, and were able to leave the site on another train provided by the SRT, Pol Col Nateepat said. He added that soldiers and state officials helped transport other people from the site as well.
Pol Col Nateepat said both trains had departed Bangkok when the trailing train rear-ended the other in Ayutthaya's Phachee district. "We are still investigating the cause of the collision,'' he said.
The SRT said the accident did not interrupt traffic, as the accident spot had three tracks available.
Earlier Thursday in Trang province, a pickup truck driver was killed when his vehicle crashed into a passing train. In a third incident on Tuesday, a Bangkok-bound passenger train collided with a truck during heavy rains near Chiang Mai, killing seven construction workers in the truck and seriously injuring another.