New York City. Compared to small cities like London, Paris, or Rome there are areas where it's not on par, but its multimodal transport, energy, heating, water, sanitation systems is larger and more comprehensive than most cities in Europe.
Buses and train cars are a small part of infrastructure, regardless of whether it's the only part of infrastructure certain information ecosystems speak to. But sure. $30 billion per year over many decades for those parts, in one city, provides pretty extensive systems that don't even make sense in smaller cities.
> I bet per capita buses and train cars are dwarfed by even cities well below the tiers
And I will find even smaller US cities with even better metrics.