Pan American Games Aires in 1940, the participants decided that the first games should be held in Buenos Aires in 1942. The plans had to be postponed because of World War II. A second Pan American Sports Congress held in London during the 1948 Summer Olympics reconfirmed Buenos Aires as the choice of host city for the inaugural games, which were held in 1951. The games offered 18 sports. Countries that were part of the Commonwealth of Nations such as Canada did not compete at the first Pan American Games. The second games were held in Mexico City, Mexico. Competitions started on March
Trams in Buenos Aires a reduced fare at half the standard rate, something which was later abolished in 1949. The network saw somewhat of a resurgence following the nationalisation of the country's railways in 1948, which also saw the creation of "Transportes de Buenos Aires" (TBA) which incorporated the city's trams and buses, while "Subterráneos de Buenos Aires" (SBA) managed the underground. Under this new administration, the network saw almost all the rails and overhead lines, as well as the rolling stock, almost completely replaced in the years from 1955 to 1961. At the same time, this period saw a significant increase in traffic,