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Shoddy tunnel work cause of road cave-ins in western Tokyo : The Asahi Shimbun


Shoddy tunneling work is being blamed for a series of cave-ins in busy Chofu city, western Tokyo.
An experts’ panel set up by East Nippon Expressway Co. explained in a report released Feb. 12 that the company had been tunneling deep underground for its Tokyo outer ring road when a number of cave-ins occurred and huge cavities formed.
According to transport ministry officials, this is the first such instance in connection with a law that took effect in 2001 related to the usage of underground areas at great depths.
The report found that heavy bore machinery encountered difficulties tunneling into the bedrock. Chemicals were poured into the site to facilitate the work. But that led to the machinery excavating an excessive amount of dirt and creating cavities in the area above the machinery that formed the uppermost section of the tunnel. ....

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Chinese researchers unveiled the prototype for their new maglev train


Scientists at Southwest Jiaotong University presented the futuristic machine on Wednesday, claiming that once its final lightweight carbon fiber iteration is put into full operation sometime in the next six years, should be able to attain speeds maxing out at 497 miles-per-hour. 
All aboard and take a look.
Video of China unveils state-of-the-art maglev train prototype designed to travel at 620km/h
Currently, China holds the distinction of owning the world s fastest maglev rail service, Shanghai Transrapid, which tops out at 267 miles-per-hour and began carrying passengers back in 2002.
Chuo Shinkansen is a Japanese maglev train employing similar superconducting tech presently under construction that will zoom down the rails at 310 miles-per-hour. It s slated to start zipping between Tokyo and Nagoya in 2027, with plans for expansion to Osaka. ....

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