Train services on the North and Northeast routes were expected to resume normal operation about 8pm on Friday after a Bangkok-bound train derailed in Bangkok's Lak Si district in the afternoon.
The six-car third-class train travelling from Phitsanulok to Bangkok was derailed about 2.45pm as it was nearing Lak Si station.
Six carriages left the track and the sixth blocked outbound rail traffic, causing delays for passengers travelling on the North and Northeastern routes.
Four passengers, one of them a pregnant woman, suffered minor injuries and were taken to Vibhavadi Hospital, said Prapat Chongsanguan, the governor of the State Railway of Thailand (SRT).
Officials were investigating the cause of the derailment, Mr Prapat said.
Work crews trying to clear the line had managed to move two of the carriages as of 6pm. Normal service was expected to resume no later than 8pm.
The derailment forced the SRT to cancel five services including two on the Bangkok-Lop Buri route and one each on the Bangkok-Ban Pa Chi, Bangkok-Kaeng Khoi and Bangkok-Ayutthaya routes.
Photos by Pattarapong Chatpattarasill
