"The transportation layer will include a high-speed rail system, which is claimed to allow people to go from one side of the city to the other side in 20 minute

"The transportation layer will include a high-speed rail system, which is claimed to allow people to go from one side of the city to the other side in 20 minutes when finished, reaching a speed of 512 km/h, which is faster than existing high-speed rail at the time of announcement." https://en.wikipedia.org/wiki/The_Line,_Saudi_Arabia https://en.wikipedia.org/wiki/The_Line,_Saudi_Arabia Going from one side to another (170 km) one would need an average(!) speed of 510 km/h (170 km/20 min * 60 min/h) . I think they would need something like Hyperloop to do that.