Trolleybuses in Valparaíso, Chile, have provided a portion of the public transit service since 1952. The trolleybus system is the second-oldest in South America. The originally state-owned system has been privately owned since 1982, and since 1994 it has been Chile's only operational trolleybus system. Almost half of its vehicles were built in 1946–52 by the Pullman-Standard Company, and they are the oldest trolleybuses in regular service anywhere in the world. Those vehicles were collectively declared a national monument by the Chilean government in 2003. They helped the city gain its designation by UNESCO as a World Heritage Site, and have been called "a heritage sight in their own right" by at least one travel writer. In 1991–1992 the system acquired several secondhand trolleybuses from four Swiss cities. Even these vehicles, already old at the time of acquisition, became historic in their continued service after some 45–50 years or more, with 1959-built ex-Zürich number 105 being the oldest articulated trolleybus of any make still in service on any trolleybus system worldwide for almost 20 years until its retirement in May 2015. In the late 2010s, a new group of secondhand Swiss trolleybuses, 18 1989-built NAWs from the Lucerne trolleybus system, replaced all of the older Swiss vehicles, and now make up more than half of the fleet, with vintage Pullman-Standard trolleybuses continuing to make up the remainder. The Valparaíso trolleybus system has become one of the icons of the city, considered an important part of its cultural heritage. Many – as residents of this port city commonly call themselves – are fond of their city's distinctive and historic trolleybus service and have spoken up in its defense when the system has come under threat of closure. The private operating company receives no government subsidy, and at times it has struggled financially, putting the system in danger of being closed. One such occasion, the company's announcement in May 2007 of imminent closure plans, brought an outcry from local citizens, and even Chile's president, Michelle Bachelet, expressed support for keeping the trolleybuses going. Trolleybuses currently serve two routes, numbered 801 and 802 in a regional transportation plan implemented in 2007, Monday through Saturday, from about 7 a.m. to 10 p.m. There is no service on Sundays. Both routes connect Barón with Aduana, 801 via Avenida Pedro Montt, 802 via Avenida Colón and each is about long. The system is currently owned and