>>1309446The first event two years ago was caused by speeding as the tram company applied stricter pressure on its drivers
The second event happened a while ago they said that's caused by "unknown small metal chip" stuck in the rail
The third event was not reported by media in details because the tram was not carrying other passengers and media probably somehow get used to news and at the time the tram company said they need tine to investigate the event, so I am completely out of the blank regarding what's the cause.
Actually, searching the internet, there are even a number many other incidents including the tram derail that didn't roll over that simply didn't caught my attention