915 resultados para Concrete railroad ties Safety measures


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Transportation Systems Center, Cambridge, Mass.

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Texas State Department of Highways and Public Transportation, Transportation Planning Division, Austin

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Federal Highway Administration, Office of Research and Development, McLean, Va.

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Federal Highway Administration, Office of Research and Development, McLean, Va.

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National Highway Traffic Safety Administration, Washington, D.C.

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Mode of access: Internet.

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"NRC FIN no. B5688."

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Mode of access: Internet.

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Summaries of the data gathered for this project.