The Xochimilco Light Rail (locally known as the Tren Ligero and known by the government as Tren ligero de la Ciudad de México) is a light rail line that serves the southern part of Mexico City. It connects to, but is not considered a part of the Mexico City Metro. Rather, it is operated by the Servicio de Transportes Eléctricos (STE), the authority that operates Mexico City's electric trolleybus system and formerly operated the municipal electric tram system.