City officials said the operation would take more than a day including safety reinforcement, dismantling and cleanup work.
Should the work proceed as planned, it is expected to be completed by early Saturday morning, allowing train services underneath to resume after test operations.
Roads near the construction site will remain fully closed until the afternoon so workers can quickly remove unstable structures, ensuring public safety and resuming normal traffic and train services.
The aging overpass had been under demolition since last summer, with plans to be fully demolished by early next month, but work was halted on Tuesday after part of the structure became unstable. Several hours later, a section of the overpass collapsed during a safety inspection, leaving three workers dead and three others injured.
The collapse disrupted train services linking Seoul to Paju and other northern areas of Gyeonggi Province, as the affected section was located above railway tracks.
According to state-run rail operator KORAIL, train services are currently operating at about 80 percent of normal levels.
Meanwhile, police earlier in the morning raided multiple locations including the offices of the city government and main contractors and subcontractors to gather evidence, determine the cause of the collapse, and identify those responsible.
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