Perhaps the success of the rail system identified by the OP is due to the diversity of ownership and management systems. It's a spectrum of public, private and voluntary sector, a true melting pot of different business cultures. Sure, no proponent of any business culture is really happy, but that's a feature not a bug, right?
Those who prefer private enterprise can marvel at a number of thrusting businesses within the franchise system and, for those who really like free enterprise, there is a handful of open access operators.
The other camp who believe in state enterprise get the satisfaction of knowing that Network Rail is government owned. Imagine the joy for proponents of a nationalised train operator to discover there is in fact a whole smorgasbord of national operators to choose from: France, Netherlands, Germany and even Hong Kong! Want to wave the flag of your own British nationalised operator? That'll be East Coast.
For those who believe in the goldilocks approach of mixed economy: regionalisation and municipal control with partnership style franchises there is Transport for Wales leading the way.
Voluntary sector or the civic activism scene more your thing? Go heritage railways and community rail partnerships!
With such a diverse ecosystem containing public, voluntary, private and all in-between, it is no wonder this whole nationalisation versus privatisation debate has been well and truly put to bed.