* Taisei, Kajima, Obayashi, Shimizu to face charges - regulators
* Cos suspected of bid-rigging in maglev-related contracts
* $80 bln maglev line to link Tokyo, Nagoya, Osaka (Adds Taisei, Kajima comments)
TOKYO, March 23 (Reuters) - Japanese regulators said on Friday that they would press criminal charges against four construction firms for suspected collusion over contracts for an $80 billion high-speed magnetic levitation (maglev) train line.
The firms include Taisei Corp, Kajima Corp , Obayashi Corp and Shimizu Corp. The Japan Fair Trade Commission said it would also press criminal charges against an official at Taisei and another at Kajima.
A Shimizu spokesman told Reuters the firm was deeply sorry and that the incident was regrettable. Kajima said in a faxed comment it was taking the charges seriously and that it was deeply sorry for causing trouble.
A Taisei spokesman said in an email that the firm did not think the case violates anti-trust laws, although it was taking the incident seriously. Obayashi said it was still looking into the charges.
Prosecutors and anti-trust agency officials have been investigating the so-called “big four” group of Japanese construction firms for suspected antitrust breaches relating to the high-profile maglev project since last year.
Japan’s large and politically influential construction industry has been a frequent source of scandals such as bid-rigging.
Legislation has been tightened in recent years to prevent collusion over contract bids, and Obayashi in 2006 required managers to sign a pledge to abide by antitrust laws. The next year, however, the firm’s top management resigned following a public works scandal. (Reporting by Yoshiyasu Shida; Writing by Minami Funakoshi; Editing by Chang-Ran Kim and Stephen Coates)