I rode a high speed train (250kph) in Spain. It was a nice trip.
“With a price tag of just €17.7 million per kilometre, Spain’s construction expenses for high-speed rail remain well below the €45.5 million incurred by other high-speed rail nations.”
[I noticed no publication date.]
https://www.globalrailwayreview.com/news/147158/spanish-high-speed-rail/
1 Euro = 1.08 Dollar
1 kilometer ~ 5/8 mile