Makkasan police have sought court detention for the train driver and railway barrier operator in the fatal Asok-Din Daeng train-bus collision, while the SRT says a preliminary test found cannabis and methamphetamine in the driver’s system and admits drug screening was not routine before each shift.

Makkasan police have charged only the freight train driver so far after a train hit a Route 206 bus near Airport Rail Link Makkasan, killing eight people and injuring dozens.