Air Quality Raises Concern at Train Wreck Site
Officials ordered Paulsboro residents to stay inside and closed the schools when air quality monitoring detected unsafe levels of vinyl chloride around 6 a.m. Monday.
They dropped below unsafe levels by 9 a.m., but the shelter-in-place order remained.
More than 100 residents have already been evacuated as a precaution while workers tried to remove the hazardous chemical from a ruptured tanker car.
Federal investigators said Sunday that Conrail crews had studied reported signal problems at the railroad bridge where the derailment occurred.
The NTSB is reviewing records with a focus on the reported signal problems and a 2009 train derailment on the same bridge.
Dozens went to a hospital with breathing and other issues after Friday's derailment. No serious injuries were reported.
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