It appears to me at least that a balanced view is being portrayed by this thread - I cannot see much in it to take umbrage about.
To clarify my last question, I wonder if there may well be an issue with foreign tourists who are genuinely unaware that walking along railway tracks is not permitted in this country. The signs at the end of platforms often say "Passengers must not cross the line" whereas something on the lines (ho ho) of "It is an offence to trespass on the railway - passengers must not proceed beyond this point" might do more to prevent prevent future incidents.
Will there be a RAIB report about this incident?
It is certainly forbidden to walk on rail tracks in France and I think likewise in Germany. Also, everyone is expected to know this without the need for a sign.
And I saw an example in France just this afternoon where the only sign at a gate to the track was the current SNCF logo. I assume this means SNCF Private property.
In your suggestion, you quote "passengers". And walkers who join the line at any point between stations (maybe having scaled a fence)?
No, railways are like roads, if you want to get run over, walk down the middle, otherwise walk where you can step out of harms way if harm arrives.