Just the facts; mostly officially confirming what has already been reported in the thread.
One thing that hadn't been reported was that train control called out a track crew to help apply the hand brakes. After the train ran away it was realised that they had been applying the hand brakes on the wrong train.
(Edit: rereading a few fresh details. The driver exited the cab at the request of train control asking him to confirm the location of the train. He was then given the option of staying in the cab to await backup from the track crew, or to start applying the handbrakes. He chose to apply the handbrakes - being helpful. The driver left the cab with the independent air brake fully applied (i.e. less than the 120% emergency value that the ECP brakes were applied at), and the automatic brake applied at 39%.
Once the runaway started train control informed the train crews of three opposing empty car movements to stop and move to a safe distance.
The derailment occurred at 144 km/h about 36 minutes after it started to runaway.)