I'm surprised that they don't publish the minimum cut-off score. For example, OASC at Cranwell (the RAF aircrew selection centre) basically says, if you score less than x then you automatically fail, however y is the score that you need in order to be competitive (i.e. to make it through to the next stage ahead of the other candidates).
It would be decent of them to send an email to everyone who beats the minimum cut-off but who isn't competitive enough, basically explaining the position.
As for the 94-96% fail rate, how many of the applications don't stand much of a genuine chance? The initial sift statistics for members of these forums seems to be much higher, though I sense that is because people on here have done their research and know more about the role.
That unfortunately, for those employed externally, is the railway. Applications take an age to process, and for those unfortunate not to make the grade, some are left in limbo, by not being told, if they are a fail or a pass. Surely a TOC will concentrate their contact with their chosen few, rather than to inform the many thousands, who are unsuccessful. Yes it's rude, unprofessional, whatever you wish to call it, but even a no thank you, incurs a cost. There are numerous factors, all beyond my 'intellect', as to why two people, who have scored the same, with the same backgrounds, with the same blah blah, as to why one fails, and one proceeds.
94-96% shows how sought after a drivers job is. There's no shame in not proceeding. Many others are also in the same boat. Working on the railways, isn't what it's all cracked up to be, as it's not all roses, at times.
Perhaps, the drawn out application process, is another test of your suitability for your TOC. They are about to spend and invest a huge amount of cost/time in you. Wouldn't you want to be certain that they, the successful applicants, have all the attributes before undertaking this cost?
Sit back, relax. You've done all you can for now, by submitting an application. Good luck to those, who are selected beyond the preliminary stages..