Subte Linea A
In Buenos Aires the metro or subway is known as "subte", and as mentioned in a previous article, it is a great way of getting around the city. In fact, el subte is my favourite means of transportation. There are 5 subway lines and each of them is identify by a letter (obviously these are A, B, C, D, and E). But, if you come to Buenos Aires, you have no excuses for not taking the oldest subway line in the country. This is the linea A. The "A" line was the first one to open and it was built back in 1913. Its first station was inaugurated on December 1st 1913, making it the oldest metro system in South America, the Southern Hemisphere, and the entire Spanish-speaking world. There are some original wagons still running from those days. It is like being in 1913 when you get into one of those. More so, it feels like you have slipped into an Indiana Jones movie! They are very cosy, with wooden seats, old style electric lamps and mirrors. The doors open manually. But be warned, they have a habit of breaking down sometimes. But hey, it is not like you have to go anywhere, right? It is just a ride. Occasionally they will use modern trains on that line. If you see a modern gray train, just wait for the next train. The A line goes from Plaza de Mayo to Primera Junta. The ideal route to have the change to travel on it is from Plaza de Mayo to Congreso Station, a short ride but well worth it. You have to pay $ 0.90 for one trip (about usd 0.30). You don't have to pay again if you change to another line. You will only have to pay again if you left the station.
http://www.urbanrail.net/am/buen/buenos-aires.htm