NS is state-owned so all fines are just money transfer between two branches of the government. Also, they know that "the trains fail with current amount of public funding, I wonder if less funding will improve the situation" is not good logic. Therefore there won't be any actual fines.
> and I think in an extreme case they can lose their concession
And then what? Most of the country will be left without trains? The company will be dissolved and replaced by the Chinese? Not gonna happen.