> It also requires that your average transit rider have enough income,
London incomes are substantially lower than New York incomes, while transit fares in London are substantially higher.
> and that the transit system be clean and comprehensive, which requires investment.
London’s and New York’s subways have almost identical track mileage in cities that are similar in population and density. London’s system is expanding more now, but again that’s due to more liberal policies in New York. The US has some of the strongest public sector unions in the world, which drives up capital costs. It also has stringent environmental review and public participation laws for transit projects, which again drives up capital costs. These are all “liberal” policies.
As to cleanliness, cleaning is an operating cost, and that’s an example of something that the US does in a “liberal” way (cleaning staff typically are government employees), while Europe often does in a “conservative” way. In the case of London, cleaning is an operating cost Transport for London is required to pay for through ticket revenue, while in New York the government covers half the cost. And in Stockholm, cleaning, along with most other operations, is done by private companies.
> You can't build a great transit system by starving it of revenue.
New York spends twice as much per passenger mile as London in operating costs, and several times as much for equivalent new infrastructure. In no way is New York’s system starved of revenue. Same for DC, Chicago, Boston, etc. None of these systems are “starved for revenue.”