A wheel fell off a Yellow Line monorail train and hit a taxi in Samut Prakan on Tuesday evening. No casualties were reported.
The incident happened at about 6.30pm on Thepharak Road, above which the elevated railway runs.
A rubber wheel from a Lat Phrao-bound train fell onto the road and bounced onto the bonnet of a green-yellow taxi near the Si Thepha station.
The taxi driver said the impact made a very loud sound. He and his passenger were not injured but the passenger was shocked and got out of the taxi immediately.
Local police said the falling wheel was a stabilising wheel that normally rolled along a side of the concrete monorail beam.
It was reported that the Yellow Line service continued and the damaged train had already entered its depot.
The incident was the latest mass-transit embarrassment, coming just nine days after a four-kilometre length of electrical conductor rail fell from the Pink Line monorail in Nonthaburi.
In that incident, three vehicles were damaged but no casualties were reported as it happened around 4am when no trains were running.
The 30.4-kilometre MRT Yellow Line serves Bangkok and Samut Prakan, with 23 stations along the Lat Phrao and Srinakarin Road corridors. Service began in July last year.
The trains used on both monorail lines are made in China.
