“The most train centric countries in the world are also the most capitalist.”
That’s because most countries in the world are capitalist mate.
Also, if you acknowledge that JR Rail is not capitalist, even if China is defined as a state capitalist country you still have to acknowledge that the rail system itself is not capitalist (it is also state owned like JR rail).
The fact is once profit is prioritised in something like mass public transportation, it starts to go to shit. That’s why American rail is so shit, that’s why every place in the UK has shit public transportation after privitisation bar a few cities like Nottingham, London and Manchester, and why it’s so expensive to get from city to city. Countries with largely state owned public transport tend to do better with their public transport.