goods movement industry cluster analysis task 3 final report prepared for metropolitan transportation commission by cambridge systematics inc 555 12th street suite 1600 oakland california 94607 october 2003 table of contents executive summary es 1 0 introduction 2 composition modal clusters non 4 industries key economic indicators trucking and related structure the data employment 8 warehousing distribution 10 5 growth trends competitive position 13 railroad 6 air cargo 7 marine freight intermediaries support transloading consolidation services truck stops fuel tires scales