Make it like Japan, not public, private. Then, like Japan, provide positive feedback loops so it’s in each of the 100+ train companies in Japan’s best interest to provide good service. They do this by letting the private train companies have complementary interests like shopping centers, office rental, apartments, etc such that the more people ride their trains the more business they get to their other interests.

Conversely, “public” transportation always needs flawless perfect politicians to continue to fund it