Now that winter is coming, some people are getting ready for cable cars rides at ski resorts. But what if a city used cable cars as for public transportation? Such is the case in Medellín, in Colombia, and its Metrocable system. There are currently two aerial cable car lines which are fully integrated into the mass transit system, which has two metro lines. The mobility problems in the Colombian city, with poor neighborhoods up in the mountains that surround the city, resulted in this unusual solution, and it turns out aerial cable cars have lower building costs than other options and Metrocable is using solar electricity for some of the electricity needed for the gondola rides. Motor power is still supplied from a regular thermic plant, though.