Question: Metrovías operates a transit metro system that first opened in which year ?

full_context: Document 1: Santiago Bernabéu (Madrid Metro): Santiago Bernabéu is a metro station outside the Santiago Bernabéu Stadium in Madrid, Spain. It is located in Fare Zone A. It primarily serves the Santiago Bernabéu Stadium of Real Madrid.
Document 2: Juan Manuel de Rosas (Buenos Aires Underground): Juan Manuel de Rosas is a terminus station on Line B of the Buenos Aires Underground. It is placed beneath Avenida Triunvirato, between Avenida Monroe and Avenida Franklin D. Roosevelt, in the Villa Urquiza barrio, and is an important transfer center with Villa Urquiza station on Ferrocarril General Bartolomé Mitre. It is named after Juan Manuel de Rosas, a politician, army officer and caudillo who ruled the Argentine Confederation almost uninterruptedly from 1829 until 1852.
Document 3: Aerolíneas Argentinas: Aerolíneas Argentinas (English: Argentine Airlines ), formally "Aerolíneas Argentinas S.A.", is Argentina's largest airline and the country's flag carrier. The airline was created in 1949 from the merger of four companies, and started operations in  1950 (1950-) . A consortium led by Iberia took control of the airline in 1990, and Grupo Marsans acquired the company and its subsidiaries in 2001, following a period of severe financial difficulties that put the airline on the brink of closure. The company has been run by the Argentine government since late 2008, when the country regained control of the airline after it was taken over from the Spanish owners. s of 2014 , Aerolíneas Argentinas was state-owned. It has its headquarters in Buenos Aires.
Document 4: Buenos Aires: Buenos Aires ( or ; ] ) is the capital and most populous city of Argentina. The city is located on the western shore of the estuary of the Río de la Plata, on the South American continent's southeastern coast. "Buenos aires" can be translated as "fair winds" or "good airs", but the first one was the meaning intended by the founders in the 16th century, by the use of the original name "Real de Nuestra Señora Santa María del Buen Ayre". The Greater Buenos Aires conurbation, which also includes several Buenos Aires Province districts, constitutes the fourth-most populous metropolitan area in the Americas, with a population of around 17 million.
Document 5: List of metro systems: This list of metro systems includes electrified rapid transit train systems worldwide. In some cases, metro systems are referred to as "subways", "U-Bahns" or "undergrounds". s of October 2014 , 157 cities in 55 countries around the world host the approximately 160 metro systems that are listed here. The London Underground first opened as an "underground railway" in 1863 and its first electrified underground line opened in 1890, making it the world's first metro system. The metro system with the longest route length is the Shanghai Metro; the busiest one is the Beijing Subway; and the one with the most stations is the New York City Subway.
Document 6: Neighbourhoods of Buenos Aires: Buenos Aires, autonomous city and capital of Argentina, is composed of forty-eight neighbourhoods (locally known as barrios). The city is also legally divided into communes, each one including one or more "barrios". Among the most visited and populated "barrios" are Palermo, Recoleta, Puerto Madero, Belgrano, San Telmo, La Boca, Monserrat and Caballito. Sectors of the city are also traditionally known as neighborhoods by the inhabitants of Buenos Aires, but not officially by the authorities of the city; some examples include Chinatown, Barrio Norte and the Microcentro.
Document 7: São Paulo Metro: The São Paulo Metrô (Portuguese: "Metropolitano de São Paulo" ), commonly called the Metrô, is the main rapid transit system in the city of São Paulo and the largest in Brazil. It is also the second largest system in South America and the third largest in Latin America, behind the Mexico City Metro and the Santiago Metro. The five main lines in the metro system (Lines 1, 2, 3, 4 & 5) operate on 81.2 km of route, serving 69 stations. A sixth line, Line 15, is a monorail line that partially opened for service in 2014. In 2014, the four lines operated by CMSP (Lines 1, 2, 3 & 5) achieved an average weekday ridership of 3.09 million, and provided 895.6 million rides over the course of 2014; the entire Metro system served 1.098 billion passengers when Line 4 is included with the other four lines.
Document 8: Buenos Aires Underground: The Buenos Aires Underground (Spanish: "Subterráneo de Buenos Aires" ), locally known as Subte (] , from "subterráneo" – 'underground' or 'subterranean'), is a mass transit metro system that serves the area of the city of Buenos Aires, Argentina. The first section of this network (Plaza de Mayo-Plaza Miserere) opened in 1913, making it the 13th subway in the world, and first underground railway in Latin America, the Southern Hemisphere and the Spanish-speaking world, with the Madrid Metro opening five years later, in 1919. As of 2015, Buenos Aires is the only Argentine city with a metro system, but there is a proposal to build a metro in the city of Córdoba (the Córdoba Metro), while a proposal to build a metro in Rosario was shelved in favour of a tramway network.
Document 9: List of Bologna metro stations: The following was a list of stations on the Metropolitana di Bologna, an old project of underground in Bologna. The project of the underground had stalled after a dispute between Regione Emilia-Romagna, the local government and the central government. A new project has been approved in 2007 and is now partially funded by the Government. On October 13, 2009 the municipal government decided to use a project financing strategy in order to provide for a quick start of the works. The new project originally included an overground segment. On October 15, 2009 the idea of building a partially overground system was abandoned, and the system is probably going to be entirely underground.
Document 10: Metroweb: Metroweb S.p.A. is a fiber-optic network operator based in Milan, Italy. In 2011 it was acquired by F2i Metropolis, a sub-holding company for F2i First Fund (via F2i Reti TLC) and Intesa Sanpaolo (via IMI Investimenti). The current owner of the company was Metroweb Italia, a sub-holding company for F2i First Fund and Italian Strategic Fund.
Document 11: Shanghai Metro: The Shanghai Metro is a rapid transit system in Shanghai, China, operating urban and suburban rail transit services to 13 of its 16 municipal districts (except Fengxian, Jinshan and Chongming) and to Huaqiao Town, Kunshan, Jiangsu Province. Opening in 1993 with full-scale construction extending back to 1986, Shanghai Metro is the third oldest rapid transit system in China, after the Beijing Subway and the Tianjin Metro. It has seen substantial growth, significantly during the years leading up to the 2010 Shanghai World Expo, and is still expanding, with its most recent expansions having opened in April 2016. It is the largest component of the Shanghai metropolitan rail transit network, together with the Shanghai Maglev Train, the Zhangjiang Tram and the China Railway-operated commuter rail services to Jinshan and to Lingang New City in Pudong. The metro system is also heavily tied with other forms of public transport in Shanghai.
Document 12: Metrovías: Metrovías S.A. is an Argentine privately owned company that operates the Buenos Aires Underground and the Metropolitan services of Urquiza Line. 90% of Metrovías' shares are held by Grupo Roggio.
Document 13: Metropistas: Autopistas Metropolitanas de Puerto Rico, LLC (English: "Puerto Rico Metropolitan Highways" ) better known as Metropistas (English: "Metro Highways" ) is the public–private partnership, privately held company, and limited liability company that operates Puerto Rico Highway 5 (PR-5) and Puerto Rico Highway 22 (PR-22) on behalf of the Puerto Rico Highways and Transportation Authority. The company is a consortium between Goldman Sachs and Abertis where Goldman Sachs initially served as majority owner through its Goldman Sachs Infrastructure Partners II infrastructure fund, while Abertis initially served as minority partner and main operator. However, on February 2013 Abertis acquired 6% of Goldman Sach's equity, elevating its position as majority owner with 51% ownership.
Document 14: London Underground: The London Underground (also known simply as the Underground, or by its nickname the Tube) is a public rapid transit system serving London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.
Document 15: Subterranean Toledo: Still unbeknownst to many, underneath the historic town of Toledo, Spain there is an underground city made up of long-forgotten wells, caves, Roman, Arabic, and Judaic baths, as well as centuries-old cemeteries. In recent years though, more and more people have been showing interest in this often-forgotten history, and now there are at least three separate professional tour groups (Cuéntame Toledo, Visitoledo, and Rutas de Toledo) giving tourists a closer look at Toledo’s rich underground history. Even restaurants will offer a peak into the roman ruins underneath their building’s floor as Mercado de San Agustin will do through the help of glass floors, or there are places such as La Cava, that go so far as to boast a dining experience in the cellars of their building by an ancient roman cistern. In fact, the interest in Toledo’s subterranean history reached such a high point that a band named, “Subterráneo” made a song named “Toledo” in 1987. In order for this subterranean history of Toledo to mean something though, and not just get lost in history once again as the public loses attention of these historical sites for one reason or another, it is important to gather information and make it very accessible to people who have the interest in learning more, which is exactly what this page will seek to do.
ground_truth: 1913