So, should we speculate now? Should we all be speculators now?
Would that be helpful?
The only organization that can say what happened is RAIB: the "rent a theory" TV (and internet ) pundits just won't do the groundwork, don't have access to evidence or data.
They were pretty quick with the Bedford collision preliminary findings - some said too quick, but IMHO they balanced it right.
They will be under pressure from all sides to do this - to restore confidence and enable Network Rail/operators to take action that will prevent any repeat in the future.
I can't imagine that there are many people who have an interest in the incident who haven't speculated at least in their own heads about potential causes. It is simply human nature.
Equally, it doesn't seem at all unreasonable for media outlets to provide somewhat more informed speculation, for example by interviewing people who consider themselves to be experts. Many of the public are interested in the story and want to know if they are safe on the railway. In the absence of full data, speculation from these experts, based on photos, eyewitness reports, known railway procedures etc is going to be the best available public info.
In this age of instant access to social media theories, the only way for industry to stay on top of the curve is by owning the story, and rapidly presenting good factual information. At present, I don't feel that has been done well, and a vague entreaty not to speculate until the RAIB report 'in due course' and that our rail industry is amongst the safest in the world isn't really reassuring.
As others have mentioned, at Bedford the RAIB produced a decent statement pretty quickly, and hopefully they will also do so here.