Table 4. U.S. Merchandise Trade with Canada by Surface Modes of Transportation,,,,,, (millions of dollars),,,,,, Mode,,June 2006,May 2007,June 2007,Percent Change May 2007 - June 2007,Percent Change June 2006-2007 All Surface Modes,Imports,"24,138","24,344","25,072",3.0,3.9 ,Exports,"18,695","19,941","19,925",-0.1,6.6 ,Total,"42,833","44,285","44,997",1.6,5.1 Truck,Imports,"13,391","13,290","12,940",-2.6,-3.4 ,Exports,"15,020","15,135","15,195",0.4,1.2 Rail,Imports,"5,524","5,542","5,788",4.4,4.8 ,Exports,"1,740","2,365","2,095",-11.4,20.4 Pipeline,Imports,"4,331","4,386","5,233",19.3,20.8 ,Exports,143,455,554,21.7,287.0 "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.",,,,,,