I don't believe i will see this in my lifetime. A good proxy example is Shinkansen (bullet train) in Japan that also require almost straight line track for high

I don't believe i will see this in my lifetime. A good proxy example is Shinkansen (bullet train) in Japan that also require almost straight line track for high speed. They are already building one from Hakodate to Sapporo in Hokkaido (180 miles). It will be completed in 2032 (15 more years) because 70% of track will be in tunnels that need to be bored. I can't imagine east coast population density making it easy to bore a tunnel from NYC to D.C.