In China, the largest high speed train network in the world, current technology's realistic speeds for realistic routes work out to around 200km/hr against an '

In China, the largest high speed train network in the world, current technology's realistic speeds for realistic routes work out to around 200km/hr against an 'as the crow flies' distance (reference: recent 6 hour journey). This is actually very competitive with flying by the time you've done the 'get out of town' and 'security theater' parts, then the 'get back in to town' part for sort of 1000-2000km distances. After that, it's better to fly.