In comparison, the Chuo Shinkansen connecting Tokyo and Nagoya (286km in distance), which runs at a maximum speed of 505 km/h (314 mph), costs about 45 billion US dollars.
So the Chuo Shinkansen = ~ $253,218,691/mi.(9 stations)
Est. CA HSR (Stage 1) = $190,384,615/mi (15 stations)