As Dean McKenzie takes over as head of federal Occupational Safety and Health Administration’s construction directorate, he faces a long list of regulatory priorities.

In an effort to prevent train accidents on a new $2.3-billion, 10-mile-long extension line in San Francisco, the Berryessa-Valley Transportation Authority/Bay Area Rapid Transit (BART) team is installing a railroad intrusion-detection system (RIDS) that uses warning devices originally developed for protecting shipping ports from break-ins.