Authorities in Taiwan say Friday's deadly train crash occurred after a truck fell onto the tracks. The derailment has left 50 people dead, and more than 140 others injured.
Local media say authorities suspect the truck's emergency brake was broken, or not properly engaged.
The express train derailed in a tunnel in Hualien County, eastern Taiwan, on Friday morning. Railway authorities initially put the death toll at 51, but revised it down.
The officials told reporters on Friday evening that the truck, which was parked at a construction site, rolled about 20 meters down a slope, and collided with the train.
Police say the driver told them he heard a loud noise about an hour after parking the truck. He reportedly said he returned, only to learn it had disappeared.