The South Africanauthorities opened an investigation into the accident. A board of enquiry was set up. Metrorail and the South African Railway Safety Regulator were represented on the board of enquiry. An initial assessment of the cause of the accident was that the uncoupled carriages had insufficient braking power to prevent the runaway. It is reported that the handbrakes on the carriages had not been applied. As the train was not on level track, scotches were also required to be placed under the wheels of the carriages.