I, too, am jealous of China's high speed railroads. However, on the whole, China has overbuilt their infrastructure, and that may not look so smart in 40-50 years when the maintenance bills start coming due.
Noone has yet compared the Chinese construction times/costs to the replacement Baltimore Francis Scott Key Bridge: cost ~$2b, estimated October 2028. Will have 600ft bridge towers, 1600ft main span (increased from 1209ft), total span length 3300 ft, improved pier protection. Surprised they didn't add a freight rail link.