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Mexico City Metro Line B is one of the twelve metro lines operating in Mexico City, Mexico. It has 21 stations and a total length of 23.772 km (14.771 mi), 20.278 km (12.600 mi) service the line while the rest are used for maneuvers. Line B runs from downtown Mexico City north towards the municipality of Ecatepec de Morelos. Currently, it is the only line in the whole metro network to use two distinctive colors: green and gray. Alongside Line 12, Line B is one of the two metro lines of the network to have the three type of stations: underground, elevated and surface. From Wikipedia