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Do subway cars move on the seafloor after deployed?

cars deployed seafloor SUBWAY
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Do subway cars move on the seafloor after deployed?

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A four-year study conducted by DFW found that subway cars do not move once deployed. Immediately following the deployment of 250 Redbird subway cars in 2003, hurricane Isabel hit the New Jersey coast. To verify that the Redbird subway cars had not moved, the DFW performed a side-scan-sonar survey. Results indicated that the deployed subway cars were in the same positions as they were when dropped. Additional monitoring performed during 2004 – 2007 also showed that the subway cars were in the same positions. Stainless steel subway cars are equivalent in weight to the Redbirds and weigh approximately 18 tons each.

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