Mexico City Metro Line B  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 23.722 km, 20.278 km 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. Line B was planned as a feeder line that would connect Mexico City to the adjacent municipalities of the State of Mexico, such as Ecatepec de Morelos and Ciudad Nezahualcóyotl, therefore, instead of using the same numbering system as with the other metro lines, the line was named as Line B, same as in Line A, which connects Mexico City with the municipality of La Paz, also in the State of Mexico. The first stretch of the line, from Buenavista to Villa de Aragón, was inaugurated on December 15, 1999 by Ernesto Zedillo, President of Mexico from 1994 to 2000, and Rosario Robles, Head of Government of the Federal District from 1991 to 2000. The second section, from Villa de Aragón to Ciudad Azteca, was opened on November 30, 2000, six years after it was planned. Currently, out of the 390 trains in the Mexico City Metro network, 36 are in service in Line B. The following table shows each of Line 12 stations total and average daily ridership during 2019. Line B passes near several places of interest:   On its route, Line B passes through some places infamous for their considerable levels of crime including Ecatepec de Morelos, Gustavo A. Madero, Venustiano Carranza and neighborhoods such as Tepito and Colonia Morelos. Due to this, the line has a high rate of crime inside the stations and the trains, going from the presence of pickpockets and petty theft, to armed robbery and sexual assault. In 2017, at least three violent robberies were reported, in which armed men entered the wagons and stripped the passengers out of their belongings.