Table 6-5b,,, "Top Land Freight Crossing Ports, Mexican-U.S. Border: 1996",,, (Thousands of truck or rail car crossings),,, ,,, Port name ,Northbound,Southbound,Total ,,, Truck,,, " Mexico-U.S. border, total ","3,235",N,N " Laredo, TX/Nuevo Laredo, Tamps. ","1,016",517,U " El Paso, TX/Ciudad Juárez, Chih. ",556,N,N " Otay Mesa, CA/Tijuana, B.C. ",531,N,N " Nogales, AZ/Nogales, Son. ",229,N,N " Brownsville, TX/Matamoros, Tamps. ",226,198,424 ,,, Rail (number of full and empty rail cars),,, " Mexico-U.S. border, total ",286,201,487 " Laredo, TX/Nuevo Laredo, Tamps. ",116,112,228 " Eagle Pass, TX/Piedras Negras, Coah. ",62,39,101 " Brownsville, TX/Matamoros, Tamps. ",51,16,67 " El Paso, TX/Ciudad Juárez, Chih. ",22,16,38 " Nogales, AZ/ Nogales, Son. ",25,6,31 KEY: N = Data are nonexistent. U = Data are unavailable.,,, NOTES,,, North and Southbound,,, "Truck: Data represent the number of truck crossings, not the number of unique vehicles.",,, Northbound,,, Trucks: Data are for loaded and empty trucks.,,, Rail: Data include both loaded and unloaded rail cars.,,, Southbound,,, "Laredo, TX/Nuevo Laredo, Tamps., Trucks: Data are for loaded trucks only.",,, "Brownsville, TX/Matamoros, Tamps., Trucks: Data are for loaded and empty trucks.",,, Rail: Data include both loaded and unloaded rail cars.,,, SOURCES, Northbound, U.S. Department of Treasury. U.S. Customs Service. Office of Field Operations. Operations Management Database. Special tabulation., "(Washington, DC: 1998).", Southbound, "Trucks: Data compiled by Texas A&M International University, Texas Center for Border Economic and Enterprise Development based", on original data from bridge operators. Web site: www.tamiu.edu/coba/txcntr/, "Rail: Instituto Mexicano del Transporte. Manual Estadístico del Sector Transporte 1996. (Querétaro, Qro.: 1998).",