NJ train cleanup goes on; about 100 out of homes

Associated Press
A containment boom floats in Mantua Creek Saturday, Dec. 1, 2012, near freight train tank cars that derailed Friday in Paulsboro, N.J. Residents in an area of about 12 blocks near the derailment remain out of their homes as officials continued their efforts to clear a hazardous gas that spewed from a ruptured freight train car. The precautionary evacuations were ordered late Friday, hours after a train derailment, and will likely remain in effect throughout the weekend and possibly longer. The order came after readings showed higher levels of vinyl chloride in the air.  (AP Photo/Mel Evans)
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A containment boom floats in Mantua Creek Saturday, Dec. 1, 2012, near freight train tank cars that derailed Friday in Paulsboro, N.J. Residents in an area of about 12 blocks near the derailment remain out of their homes as officials continued their efforts to clear a hazardous gas that spewed from a ruptured freight train car. The precautionary evacuations were ordered late Friday, hours after a train derailment, and will likely remain in effect throughout the weekend and possibly longer. The order came after readings showed higher levels of vinyl chloride in the air. (AP Photo/Mel Evans)

PAULSBORO, N.J. (AP) — It's not clear how long it will take workers to clear a hazardous gas from a ruptured tank car that derailed from a freight train in southern New Jersey last week.

More than 100 Paulsboro residents won't able to return to their homes in the 12-block evacuation zone until at least Saturday.

Officials must remove the vinyl chloride before they can clear the track and examine what caused Friday's derailment.

Federal investigators said Sunday that Conrail crews had studied reported signal problems at the railroad bridge where the derailment occurred.

The National Transportation Safety Board is reviewing records with a focus on both the reported signal problems and a 2009 train derailment on the same bridge.

Dozens of people went to a hospital with breathing and other issues after the derailment, but no serious injuries have been reported.

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