The T-Flight is a maglev train that hit a record-breaking speed of 387 mph on a short test track — but engineers want to double that rate so the train can carry passengers at speeds faster than if they were traveling by plane.
The cost of maintenance is not really an issue when it's a state run industry. Also, China is building stuff like thorium reactors now that run on molten salt and are inherently safer. Also worth noting that any tech becomes cheaper as you deploy more of it. You get better operating practices, standardization, better safety procedures, and so on. There's nothing about nuclear that makes it uniquely expensive to maintain.