FILE - In this Friday, Nov. 30, 2012 file photo, officials work the scene of derailed freight train tank cars in Paulsboro, N.J. Residents of Paulsboro were ordered to stay inside and schools were closed Monday, Dec. 3, 2012, after unsafe levels of the chemical vinyl chloride were found in the air near where the train derailed last week. (AP Photo/Mel Evans, File)
FILE - In this Friday, Nov. 30, 2012 file photo, officials work the scene of derailed freight train tank cars in Paulsboro, N.J. Residents of Paulsboro were ordered to stay inside and schools were closed Monday, Dec. 3, 2012, after unsafe levels of the chemical vinyl chloride were found in the air near where the train derailed last week. (AP Photo/Mel Evans, File)
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) ? The National Transportation Safety Board says the New Jersey bridge where a train derailed last week had several recent signal and alignment problems.
NTSB chairman Deborah Hersman says inspectors checked out the Paulsboro bridge on Thursday after signal problems were reported.
After that, several trains crossed without problems.
But after the last one that night cleared the bridge, its crew got a radio message that the bridge failed to operate.
Hersman says that may have been an indication that the bridge did not properly swing open to traffic on Mantua Creek below.
She says when the train that derailed pulled up just before 7 a.m. Friday, the bridge signal light was red. That could be an indication that it was not locked into place.
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