commence 3 months after their approval by the Argentine National Congress, a decision which was ultimately not taken, favouring instead an underground tramway. The first Underground line was opened on 1 December 1913 and was built by the Anglo-Argentine Tramways Company (AATC), which had been given permission to build in 1909. That line was made up of one of the existing sections of Line A, linking the stations of Plaza de Mayo and Plaza Miserere. 170,000 passengers took part in the line's first trip. On 1 April 1914 the line was to expand to Río de Janeiro station and on 1 July was extended to Primera Junta Station. In 1912 the Lacroze Hermanos company won a concession to build another Underground line. The company was a competitor to the Anglo-Argentine company, operating tramways in Buenos Aires as well as the Buenos Aires Central Railway, which later became part of the Urquiza Line. Construction began in 1927, and this line became Line B when it was inaugurated on 17 October 1930. During 17–18 December 380,000 passengers travelled on the line's then 32 cars. The line was originally intended to continue above ground, with the current Federico Lacroze station to be the central terminal of the Buenos Aires Central Railway (today the General Urquiza Railway), however nowadays the overground service forms part of the Urquiza Line instead. By the 1920s, the Argentine government was dissatisfied with the lack of progress the AATC (which enjoyed a near-monopoly on the city's tramways by this point) had made in expanding the rest of the network and thus revoked its right to build any more lines in 1930, seeking instead another company to do so. By this point, the AATC had only built 48 metres of what is today Line C, a line which would link two of the city's most important rail terminals (Constitución and Retiro) together. In 1933 a third company, the Hispano-Argentina Company of Public Works and Finances (Compañía Hispano–Argentina de Obras Públicas y Finanzas (CHADOPyF), in Spanish) began construction of the other Underground lines. Line C's first section, Constitución railway station-Diagonal Norte, was inaugurated on 9 November 1934 by Agustín P. Justo, then President of Argentina. CHADOPyF opened Line D in 1937, from Catedral through Tribunales; with Line E following later in 1944, from Constitución to San Juan y Urquiza, later joining with Boedo station. By this point the advent of the