A visitors - also active in the fan communies - said, that there have been a problem with wheels of one of EGF's trains the sunday before the incident. He said that the ride ops called the technical service due to strange noise from a wheel assembly and the ride closed for the rest of the day because of several checks the technical service did. As the Holiday Park opens only in the main season under the week except for wednesday, the first time the coaster ran again was the wednesday the wagon derailed. Another fan, who was there on this wednesday, said, that there have been problems with the wheels again and EGF opend after the "problem train" of this day (we don't know whether it's the same train of which is said, it made problems the sunday before) had been replaced by the second train, which is the one whose car derailed.
If at least 50% of this is correct, strange things must happend there. I hope they will find out what caused this incident and inform 'us' what the cause was. I hope it was neither a major technical issue nor a human's fault - we will hopefully see...