Table 4. U.S. Merchandise Trade with Canada by Surface Modes of Transportation,,,,,, (millions of dollars),,,,,, Mode,,March 2006,February 2007,March 2007,Percent Change Feb. 2007-Mar. 2007,"Percent Change March 2006-2007" All Surface Modes,Imports,"24,644","21,275","25,187",18.4,2.2 ,Exports,"19,359",16.841,"19,865",18.0,2.6 ,Total,"44,002","38,116","45,053",18.2,2.4 Truck,Imports,"13,522","11,709","13,737",17.3,1.6 ,Exports,"15,238","13,281","15,306",15.2,0.4 Rail,Imports,"5,707","4,692","6,188",31.9,8.4 ,Exports,"2,048","1,657","2,343",41.4,14.4 Pipeline,Imports,"4,378","3,960","4,282",8.1,-2.2 ,Exports,310,254,222,-12.4,-28.5 "Source: BTS TransBorder Freight Data, http://www.bts.gov/transborder/",,,,,, "Note: The value of all surface modes is not equal to the sum of truck, rail and pipeline modes. The value of trade for all surface modes includes shipments made by truck, rail, pipeline, mail, foreign trade zones, other and unknown modes of transportation.  For additional detail refer to the TransBorder Freight Data ""Sources and Reliability"" statement: http://www.bts.gov/programs/international/transborder/tbdr; Numbers may not add to totals due to rounding.",,,,,, ,,,,,, ,,,,,,