According to Wikipedia: "The Buenos Aires Underground (Spanish: Subterráneo de Buenos Aires), locally known as Subte is a mass-transit subway system that serves the metropolitan area of Buenos Aires, Argentina. The first station of this network opened in 1913. It is one of the busiest metro systems in the world.
"The network expanded rapidly during the early decades of the 20th century, but the pace of expansion fell sharply after the Second World War. In the late 1990s expansion resumed, with the planning of four new lines. However, the rate of expansion is largely exceeded by the transportation needs of the city and once again the network has become overcrowded."
This photo was submitted by KW. He writes: "It is unclear whether this urinal is intended for employee use only, as there was no sign at the entrance. The automatic flushing mechanism works perfectly even though the tank looks like a plastic can."