At first I suspected it could have been a landslide but looking at the photos it seems to be in a relatively flat area

Apparently they travel at up to 150kph, and have a tilting mechanism

Has been in operation since 2013

Lots of stuff is automated these days so not sure what the 'driver's' role is exactly - but if it had been around the same bend many times before without incident you'd suspect it was going too fast on this occasion

The question is would that be the robots fault or the driver