in Copacabana was inaugurated. Cantagalo Station beyond Siqueira Campos was due to be completed in March 2006 but owing to financial problems the opening date was postponed to 15 December. This was again postponed and the final opening took place in February 2007. At the same time construction began on the subway extension to General Osório station in Ipanema. This was opened in December 2009. In late December 2007, Metro Rio renewed the concession, then defined as for another 20 years, to 2038. Line 1A from Pavuna to Botafogo opened in December 2009 with a connection between São Cristóvão and Central. Passenger traffic at Estácio is reduced and the elimination of the need to transfer between Lines 1 and 2 saves up to 13 minutes of journey time. A new station on the new section, Cidade Nova, was opened in November 2010; the station is on Avenida Presidente Vargas and serves the City Hall. In June 2010, the construction of Line 4 began, linking Ipanema to Barra da Tijuca, where most events of the 2016 Olympic Games occurred. System Rolling stock The cars are of monoblock construction in stainless steel. Passenger train composition normally use six cars (four on rare occasions), but Line 2 was planned to use eight cars. Older stock driving cars can accommodate a maximum of 351 passengers (40 seated), while non-driving cars accommodate a maximum of 378 passengers (48 seated). Thus, in six-car configurations the maximum number of passengers that can be transported is 2,214. Line 1 is served by exclusively old types of rolling stock, which are full metro. Since Line 2 was formerly a light rail line, there are some old types of stock that have been converted from light rail to metro stock. New B type stock is full metro stock. This line was initially served by old A type stock, built by La Brugeoise et Nivelles and Cobrasma. Inside each coach, seat arrangement is both parallel and perpendicular to the windows. When the left side has parallel seats, the right side has perpendicular seats, and vice versa. Each vertical seat has a handle for easier standing. There are vertical stanchions from ceiling to floor for standing passengers, one set in front of the horizontal seats, another set at the middle of the coach. Both A and B type trains are air-conditioned. Lines 1, 2 and 4 share EMUs built by CRRC Changchun