Subway in Rio
The subway in Rio (Portuguese: Metrô) is a really safe way to travel. It runs 7 days a week. Monday-Saturday 5h-00h and Sunday and holidays 7h-23h. It is quite reliable but due to insufficent maintenance stops are getting more and more common. There are three lines currently, the end stations are Jardim Oceânico in Barra da Tijjuca, Uruguai in Tijuca and Pavuna in Zona Norte.
Catching the Subway in Rio
For the regular Metrô, just buy a ticket for R$4.30 one way (unitário). Catching the Integração (English: subway shuttle bus) is possible at only a few stops. A sign with the text and a tidy cue of people marks the spot. Make sure you keep the ticket you will get, it will grant you entrance to the actual subway. If you are going to a destination that is on the route of the Integração, make sure that you get the right ticket, otherwise it won’t be valid on the bus. In the subway stations you can buy subway passes that are easy to recharge with cash. They don’t give you a discount but you don’t have to stand in line every time you are going somewhere.
Here is a map of the Metrô: