Re: Governemt "expert committees"
In 1962 GDP was roughly £27.8bn and British Rail's losses were £104m or 0.37% of GDP. In 2014 UK GDP was £1,971bn and the subsidy was £5.3bn or 0.26% of GDP. However, that subsidy figure is down from the 2006 peak of £6.3bn vs £1,403bn GDP or 0.45%.
But in honesty that's a meaningless comparison as it ignores so many variables such as volume of traffic (both freight and passenger), cost of rolling cost (note that both the East Coast and Great Western are still using rolling stock developed and built by British Rail in the 70's and 80's).
Did something need doing with the Railways in 1963? Undoubtedly the answer was yes. But the implementation of the report could have been handled better.
For reference in the 1980's Japan spent 10% of GDP on railways, a significant percentage of which was spent developing the Shinkansen network.