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adequate agencies alternative American Trucking Associations American Waterways Operators analytical application Association basic Canadian National Railways capabilities carriers concepts concerned conference coordination costs decisions Defense demand economic effective efficiency effort engineering environment example facilities factors Fagin Federal Aviation Agency functions future gas turbines growth highway important improved increased individual institutional Interstate Commerce Commission involved levels ment metropolitan areas models modes of transportation movement National Science Foundation national transportation organizations output patterns planning portation possible potentially present programs public policies question reciprocating engine regional regulatory relationships requirements responsibility result significant social statistical structure subsystems systems analysis tariff technical techniques trans transport complex transport operations transportation activities transportation industry transportation problems Transportation Research transportation services transportation system trip understanding United University urban transportation utilization various vehicles Wilfred Owen William Vickrey