With your visit to Medellin , you can take one of the most fascinating travel through the Metro , the speed , safety and comfort will make you live a unique experience, as you know the city . The Metro corresponds to one of the first experiences of modern mass transportation in Colombia . The Metro is part of the landmarks of the city since 1995. You will cross the Aburrá Valley through two transmission lines : line A north - south direction , starting from the Niquía station in the town of Bello, to the station in the municipality of Itagüí in the south; and the B Line , which runs from the center to the west of the city, starting at the San Antonio station and ending in San Javier .