Because high speed rail is a giant pit to burn money in, worldwide.
Does not make money in Japan.
Does not make money in continental Europe.
Does not make money in the UK.
Does not make money in Asia.
Does not make money in Africa.
Does not make money, every where it has been built.
Has never made money, every where it has been tried.
But they get to keep subsidizing it, for the rest of time, so that morons who are not paying for it yet, keep lusting after it.