Japanese maglev train

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FILE – In this April 21, 2015, file photo, Japanese maglev train that is the fastest passenger train in the world runs on the Maglev Test Line in Tsuru, west of Tokyo. Prosecutors raided the headquarters of several of Japan’s biggest construction companies in an investigation into alleged collusion on bids for a multibillion dollar high-speed maglev train line.

News reports Tuesday, Dec. 19, 2017 showed investigators heading into the headquarters of Taisei Corp. and Obayashi Corp., two of four companies targeted in the probe. (Junko Ozaki/Kyodo News via AP, File)

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