JR East working on quieter ways to run 360kmh on the Tohoku and Hokkaido Shinkansen:http://www.railwaygazette.com/news/single-view/view/jr-east-to-build-alfa-x-360-kmh-shinkansen-testbed.html …
They're doing this work now so they can meet the FY2030 deadline, when the Hokkaido Shinkansen opens.
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Currently it takes about 5 hours from Tokyo to Sapporo (it took 10 back in 2006); by 2030 the aim is to get that down to 3 hours.
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