Rolls royce got
nationalised because it was deep in the do do building the first trent engines (you know.. the things that power 1/2 the world's commercial aircraft)
Plus the fact it had various stratigic military products our defence needed.
Was it right to bail it out? yes.
BR was a different kettle of fish entirely, it was trying to run a national rail system in the face of unions and a subsidy less than the one given to the Paris metro
It could do nothing BUT fail
Then rail got privatised in the most illogical and stupid way until you realise it was all about breaking the power of the rail unions, you could hive off the pesky track people to sub contractors, each rail line would have multiple train operators on it so if one companies drivers went on strike, the trains would mostly still run.
Of course there was a downside
that was called railtrack...
<exec> oh why do we grind the rails every 3 months... if we did it every 6 the rails would last twice as long, anyone know?
<vice exec> nope we got rid of all those expensive engineering types who know why
<exec> ok 6 months it is..... .. .. . .. . .. . . . . what was that bang?