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In this Sept. 2, 2016 photo, a light rail train on its way downtown pauses as it passes a tarp fire on the nearby Liberty Bridge in Pittsburgh. A contractor didn't obtain a key safety permit before welding caused plastic pipe and a construction tarp to burn on the Liberty Bridge last month, resulting in a 24-day shutdown of a primary artery into downtown Pittsburgh, the city's fire chief said. (Steve Mellon/Pittsburgh Post-Gazette via AP)

In this Sept. 2, 2016 photo, a light rail train on its way downtown pauses as it passes a tarp fire on the nearby Liberty Bridge in Pittsburgh. A contractor didn't obtain a key safety permit before welding caused plastic pipe and a construction tarp to burn on the Liberty Bridge last month, resulting in a 24-day shutdown of a primary artery into downtown Pittsburgh, the city's fire chief said. (Steve Mellon/Pittsburgh Post-Gazette via AP)

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