Ummm, I did in post 122. Have you checked the link?
http://fullfact.org/sites/fullfact.o...%20of%20TR.PNG
As you can see, rather than BR being self funding prior to privatisation, it was pretty static about 40% and only started going down after privatisation. There was a fake dip in 95/96 but a more sustained decrease until the massive problems in the early 2000's with Railtrack and Hatfield. Massive investment was necessary at levels that approached (and even just exceeded) pre-privatisation costs but once achieved, have been steadily declining since 2006/7 to the low of 35% of Rail Revenue last year (not shown).
Wolmar claimed that funding (adjusted for inflation) was about £1 to £1.5bn pre privatisation and is now nearly £4bn but he hasn't taken into account the massive increase in passenger numbers (and therefore revenue) which shows that investment per customer is coming down because it doesn't suit his views.