Welcome to the Forum.
As you are a New Member and have, so far, only posted on this particular thread, it would perhaps not be totally unreasonable to assume that you may possibly have some connection with someone who has been directly affected by this unfortunate incident, whether this be train crew, signalling staff, the owners/occupiers of the premises adjacent to the crossing, or, of course, the actual driver who it is understood has serious, and quite possibly, life changing injuries.
Sadly, in recent years, the interaction of road vehicles with trains has been a significant cause of accident/injury on the railway system.
In the fullness of time, there will be a full official investigation into what has actually happened. In the meantime, idle speculation can, of course, be unhelpful as well as insensitive. This forum is quite well moderated, so if you consider any particular post to be inappropriate, it can be reported to one of the forum moderators.
It can, however, be informative to discuss, in a respectful manner, the possible contributory factors that may have led to the incident in question.
In the meantime, may I wish a full and speedy recovery to all those who have been affected by the incident.
Clearly, lessons need to be learnt from the incident to minimise the possibility of something similar ever happening again at the same location, or indeed, elsewhere on the network.