It would cost nearly US$1 billion to build a 260 kilometre rail line connecting cities in northern Colombia, according to a study by the Universidad del Norte in Barranquilla. The proposed rail corridor would link Santa Marta, Barranquilla and Cartagena, which are home to the three biggest ports on the country's Caribbean coast. The train would function as a mixed service line, transporting passengers as well as cargo. "Some details need to be worked out regarding funding sources, which depends more on the