The route directly connecting Zhujiang New Town CBD in GZ with Qianhai CBD in Shenzhen would make the most sense. However there are already multiple HSR lines connecting the three cities. I don’t find the Maglev necessary. On the other hand, once tunnelling costs could be further reduced, a maglev line (or direct HSR travelling 350+ kph) connecting Shanghai and Guangzhou might be necessary because there are currently no direct lines connecting Shanghai with the Greater Bay Area. All high speed trains travelling between the GBA and Shanghai take at least six hours, which defeat the very purpose of HSR.The city of Guangzhou, Shenzhen, and Hong Kong are planning a high-speed maglev train route with designed speed of 650 km per hour. The maglev train plan aims to build a 30-minute traffic circle among the 3 cities, and a 40-minute one among other cities of the Greater Bay Area..
The Shinkansen's long nose is primarily to prevent tunnel boom rather than reduce air friction. That's where the train acts like a piston on the air in the tunnel due to how tightly the train fits in the tunnel and results in a large and damaging shockwave, or "boom", when exiting.
No idea, but I've sat on both the Shinkansen and Fuxing. There's simply no comparison between the two. Fuxing felt motionless, even at top speed. If not for the scenery flying by you wouldn't even know you were moving. The Shinkansen is still a smooth ride, but nowhere near as flawless as the Fuxing.
