Kansas City Southern is a transportation holding company with two primary subsidiaries. The Kansas City Southern Railway Company, is one of seven Class I railroads operating in the United States. Kansas City Southern de M'xico, SA. de C.V. is one of three large regional railroads in Mexico. KCS also owns 50% of the Panama Canal Railway Company in Panama. The combined North American rail network comprises approximately 6,000 miles of rail lines that link commercial and industrial markets in the United States and Mexico.