Investigators with the Tokyo District Public Prosecutors Office enter the Tokyo headquarters of Taisei Corp. in December 2017. (Asahi Shimbun file photo) The Tokyo District Court found two major construction companies and two former executives guilty of bid-rigging on a high-speed rail project, a scandal the presiding judge said damaged public trust. The ruling on March 1 found Taisei Corp. and Kajima Corp. guilty of bid-rigging for construction of the Linear Chuo Shinkansen Line. The companies were each fined 250 million yen ($2.3 million). Two former executives, Takashi Okawa, 70, a former managing executive officer at Taisei, and Ichiro Osawa, 63, a former department head at Kajima in charge of the maglev project, were also found guilty and given prison sentences of 18 months, suspended for three years.