on colors and visual signs. The logos are not assigned at random; rather, they are designated by considering the surrounding areas, such as: The reference places that are located around the stations (e.g., the logo for Salto del Agua fountain depicts a fountain). The topology of an area (e.g., Coyoacán—in Nahuatl "place of coyotes"—depicts a coyote). The history of the place (e.g., Juárez, named after President Benito Juárez, depicts his silhouette). The logos' background colors reflect those of the line the station serves. Stations serving two or more lines show the respective colors of each line in diagonal stripes, as in Salto del Agua. This system was adopted for the Guadalajara and Monterrey metros, and for the Mexico City Metrobús. Although logos are no longer necessary due to literacy being now widespread, their usage has remained. Under construction: Transfers to other systems The Mexico City Metro offers in and out-street transfers to four major rapid transit systems: the Mexico City Metrobús and State of Mexico Mexibús bus rapid transit systems, the Mexico City light rail system and the Ferrocarril Suburbano (FSZMVM) commuter rail. None of these are part of the Sistema de Transporte Colectivo network and an extra fare must be paid for access. Metrobús line 1 was inaugurated in 2005. According to the 1985 STC Metro Master Plan, Metrobús Line 1 roughly follows the route planned for STC Metro Line 15 by 2010, which was never built. Every transfer is out-of-station, but the same smart card may be used for payment. All five lines (Line 5 to be built during 2013) offer a connection to at least one STC Metro station. STC Metro stations that connect to Metrobús lines include Indios Verdes, La Raza, Chilpancingo, Balderas, Etiopía / Plaza de la Transparencia, Insurgentes Sur and others. The sole light rail line running from Tasqueña to Xochimilco is operated by the Servicio de Transportes Eléctricos and is better known as Tren Ligero. Line 2 terminal Tasqueña offers an in-station transfer, but an extra ticket must be purchased. In 2008, the Ferrocarril Suburbano commuter rail, commonly known as Suburbano, was inaugurated with a sole line running from Cuatitlán to Buenavista as of 2013. STC Metro offers two in-station transfers: Line B terminal Buenavista to the Suburbano terminal of the same name, and Line 6 station Ferrería / Arena Ciudad de México into Suburbano station Fortuna. An extra fare must be paid,