It’s going to cost more that they think. Railways always do. The financial model won’t work because commuters won’t be prepared to pay the price of a ticket to make it financially viable, so it will need to be subsidized by the tax payer. You will have a free market vs socialized transportation debate, that will ultimately become shaped by necessity, rather that keeping up with the Chinese. A big problem is CA cities are not designed around a public transportation system. You may be better off working with what you’ve got and improving upon it. Would it impact cities, real estate. You bet!