de Mayo station as well as free rides for the entire city in order to mark the event. Throughout the week that followed, there were also numerous displays and events across the different lines of the Underground. Currently, the Polvorín Workshop – originally inaugurated along with Line A – is being transformed into a museum to display artefacts and the former rolling stock of the Underground. The workshop also serves as the headquarters for the Association of Friends of the Tramway and many of the Underground's historical artefacts are stored there, such as the wooden UEC Preston "palace cars", which also make appearances on Line A during special occasions such as anniversaries and even the inauguration of president Raúl Alfonsín in 1983, where he and other officials were transported from the National Congress to the Casa Rosada using these cars. Artwork and exhibits The network has over 390 artworks by over 170 artists across its stations, ranging from historic murals to modern art. Styles also vary, from mosaic to fileteado, sculpture and installation pieces. Many stations are decorated with intricate ceramic tile work, some of which date back to 1913 when the Underground first opened its doors. Featured artists include painters and reproductions by Quino, Molina Campos, Raúl Soldi, Rodolfo Medina and Jorge Schwarz. In addition, they provide spaces for music and theatre events, including an underground iteration of the Pepsi Music Festival on Line H. Line A The oldest line on the network has maintained its original appearance from 1913 and 1914 on the Plaza de Mayo – Primera Junta segment following restoration works in 1988 for the 75th anniversary of the line and again in 2007. These older stations feature no advertisements, but instead have recreations of original advertisements from the early 20th century. The Line's newest segment, which runs from Puán to San Pedrito, displays more modern artworks, such as those by Uruguayan artist Guillermo Roux at San José de Flores station. Line B In Tronador – Villa Ortúzar station there are 18 stained glasses that refer to the history of the Villa Ortúzar neighbourhood, where the station is located. In Los Incas – Parque Chas station there are murals related with different Pre-Columbian era civilisations are exhibited. In 2015, SBASE faced criticism for its incorporation of new artworks in multiple stations on the line. Many of these artworks were painted directly over tiles dating back to