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Office of the Secretary (OST)

Federal Aviation Administration (FAA)

Federal Highway Administration (FHWA)

Federal Motor Carrier Safety Administration (FMCSA)

Federal Railroad Administration (FRA)

Federal Transit Administration (FTA)

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Pipeline and Hazardous Materials Safety Administration (PHMSA)

Great Lakes St. Lawrence Seaway Development Corporation (GLS)

U.S. DOT Volpe National Transportation Systems Center (U.S. DOT Volpe Center)

Build America Bureau