I'm only offering an opinion based on a few smart cookies that have spent their lives working on the West Coast mainline.... Probably all " tosh " though. .....PS...The last time i read an update they hadn't even aquired all the land required and that was billions into the project.
Your experts are better than mine?
As I said, I was very sceptical about the whole thing and had it explained to me, in great detail, by someone I like and respect whose job it is to know about all this stuff. It takes a lot to make me change my views on anything......