Being rather pedantic, wasn't this on a service which was (until fairly recently) in a semi nationalised state. During which time although a fair amount of money was paid to the government, very little was done to improve services. Whilst with no extra trains the private company has provided some extra services.
I admit that one reason that it probably didn't do much was because of a government project to replace the trains (about 12 years for IEP rather than about 4 years for GA fleet replacement).
If those are "good" examples of government run rail projects, then those who want a state run railway may have to be careful what they wish for.
(that isn't to say that privately owned run railways are better, you just need to look at Southern for a bad example of that, rather the grass may not be greener or your glasses may have a slight pink hue to them).