The subway or underground in Buenos Aires is called the Subte and it is a great and affordable way to get around the city.
There are a couple of lines that have such ancient trains that I will never again complain about the C Train in NYC.

Subte, Buenos Aires, Argentina; Leica MP 0.72, 35mm Summilux, Kodak Tri-X © Doug Kim

Subte, Buenos Aires, Argentina; Leica MP 0.72, 35mm Summilux, Kodak Tri-X © Doug Kim

Subte, Buenos Aires, Argentina; Leica MP 0.72, 35mm Summilux, Kodak Tri-X © Doug Kim

Subte, Buenos Aires, Argentina; Leica MP 0.72, 35mm Summilux, Kodak Tri-X © Doug Kim

Subte, Buenos Aires, Argentina; Leica MP 0.72, 35mm Summilux, Kodak Tri-X © Doug Kim

Subte, Buenos Aires, Argentina; Leica MP 0.72, 35mm Summilux, Kodak Tri-X © Doug Kim