Trams were once extremely common in Buenos Aires, with the city having a large 875 km tramway network and the largest tramway-to-population ratio the world, which gained it notoriety as "the city of trams" across the world. The first trams began operating in the 1860s, however by the 1960s the network was dismantled and replaced by buses. There is a Heritage Tramway maintained by enthusiasts that operates a large collection of vintage trams on weekends, near the Primera Junta Underground Line A station in the Caballito neighbourhood.