I'm not disagreeing with you, but I think most of the difficulty in the CAHSR project didn't come from technical challenges. It came from mismanagement and NIMB

I'm not disagreeing with you, but I think most of the difficulty in the CAHSR project didn't come from technical challenges. It came from mismanagement and NIMBYs, in particular NIMBYs in Atherton, Palo Alto, the Tehachapi pass, and other segments that blocked construction and put the project into a death spiral.