Record-smashing Chinese maglev hyperloop train hits 387 mph and could someday outpace a plane

When large scale projects are publicly owned, then there isn't really a worry about economic sustainability. In fact, this can be seen as long term job creation since these projects will require on going repair and maintenance. It also looks like countries in the Global South are already benefiting as China's been exporting their infrastructure there. For example, China built high-speed rail in Indonesia and subway in Vietnam.