What does that mean? I'm not sure if I correctly interpret that as somewhat dismissive, as if a good train system was a given or not. It's the result of political will and investment.
A bit like when you get Zerg rushed in Starcraft and say "Well sure but that's because they built so many units early on". It's a decision, and becoming good in that metric was precisely the intent. Also not to do so is a decision. Unlike in Starcraft, the decision to neglect your public transport is not a similarly viable strategy.