With most major European cities well-served by trains and buses, bringing US transit up to par would cost $4.6tn

The only train station in Houston, the US’s fourth-largest city and one of the fastest-growing conurbations in the country, is a diminished, morose sight. Intercity trains arrive at this squat, shed-like Amtrak building, which cringes in the shadows of roaring highways, just three times a week.

That such a meager train station could ostensibly serve a metropolitan area of about 7 million people is a stark symbol of how the sprawling, car-dominated US has fallen behind cities around the world where people can rely on extensive, high-quality public transport to get around.