I wonder whether the divorce between the rolling-stock operators and the permanent way companies has had an effect.
Once upon a time the tracks and trains were adequately maintained and equally safe (or otherwise). Now it appears the rolling stock has become strong enough to withstand the sort of 90mph disasters which are becoming more common on poorly-maintained track. There must be a knock-on in terms of fuel use, raw material use and frequency of breakdown due to the bulk and weight of the engines and carriages. At each breakdown or accident, the various companies all blame each other at the expense of solutions, progress.... and the taxpayer.
Travelling by rail these days reminds me of the John Glenn (?) comment of being miles above the earth amid 20,000 components each of which was manufactured by the lowest tenderer.