Skanska Koch project employees Victor R. Martins and Donato G. Fiocca were struck by a train on a track supposed to be shut for repairs, officials said.
State Division of Occupational Safety and Health officials are investigating the death of Chritopher Paul Smith, an employee of specialty contractor F.D. Thomas Inc.
A 100-ton hydraulic drill rig tipped over onto the street at the site of the Chicago Transit Authority's $2.1-billion Red/Purple line project. No injuries were reported and the cause of the incident is being investigated.