For all its existence it has been 100% state-owned and state-controlled, yet because it's a failure, it's still somehow "not state, but actually privatized", even though not "full actual privatization" (but only imagined privatization).
I understand the desire to have a scapegoat for failure, and to externalize it in some abstract capitalists/neoliberals/conservatives, but abandoning reality to create your own world has no predictive power and is not a long-term strategy.
We don't usually think of the board of directors as controlling a company, nor the shareholders. They appoint a CEO, and then are hands-off unless the CEO really fucks up. This principle still remains true when the shareholders are a state.
Please read again and don't put your own ideological spin on my words, please. I fully blame governments and politicians for all failures. I did not write that it's "actually" or otherwise privatized, in fact I wrote "you're right that it's not privatized".
The root cause is still privatization attempts and politicians that don't like well run public infrastructure and sabotage it through underfunding and bad requirements/structure. These are the same people that always claim that infrastructure will work perfectly well when just sold off to the private sector for maximum profit extraction. The working long term strategy is to get these out of position of power - however as is common, people like to vote against their own interests for ideological and emotional reasons.
No need to abandon reality, austerity and idiotic state underfunding of basic infrastructure (not just rail) have been the norm in Germany for decades. This isn't some crackpot conspiracy, but well accepted reality.