by Jorge Madrid
The public transportation system in Medellin, Colombia, is one of the most successful in the world. It is successful for promoting not just environmental sustainability, but social equity as well.
In 2012, it was named one of the top transport systems in the world by the Institute for Transportation and Development Policy (ITDP), a global consortium of organizations founded in 1985 to promote sustainable transportation worldwide:
“The city [of Medillin] transformed violence and despair into hope and opportunity, using sustainable transport as one of the key levers to drive change,” said ITDP board member Holger Dalkmann.
The crown jewel of the city’s transportation system is the Metro de Medellín, a network of clean and efficient metro cars that serves over half a million (553,000) passengers every day. This project was financed by a public-private partnership led by the city; construction took ten years, with the last major expansion completed in 2006. The system saves 175,000 tons of C02 every year, the equivalent of planting 380,000 trees that would occupy 11% of the city’s land mass. Metro calculates that it saves the city $1.5 billion in respiratory health costs every year, and $4 billion in reduced traffic accidents and congestion.
Perhaps the most impressive feature of the metro system is the world renowned metro cablé system, a network of 9 cable car systems that take passengers up steep mountainsides that line the Valley of Medellin. The lines were completed in 2010 with plans for future expansion. The metro cable system has revolutionized mobility and accessibility for residents of Colombia’s second largest city, particularly the poorest — and often most violent — communities that line the valley of Medellin’s mountainous region.
As we approach the town of Manatí, in northern Colombia, I look eagerly out the window for signs of change. When I was here 



