The matter was postponed to 24 April for further investigations, police spokesperson Sabata Mokgwabone said.
Qawukeni Lwandile, 27, would remain in police custody.
Lwandile was the driver of a Toyota Avanza carrying 12 pre-primary and primary school children, when a train smashed into the vehicle at a railway crossing between Zinniaville and Rustenburg Noord on 20 March.
Police alleged that Lwandile passed other motorists who were waiting at the train level-crossing to allow an oncoming train to pass.
The vehicle got stuck on the level crossing and a train hit and dragged it, killing an 8-year-old boy on the spot.
Two more children were declared dead on arrival at the Job Shimkane Tabane Hospital.