|Subject: Re: Pantanal...Buenos Aires|
There are no trains from Rio to Buenos Aires. There are buses but it is a long trip. I know that from São Paulo to Montevideo the bus trip takes about 34 hours. So from Rio to Buenos Aires it should be more than 40 hours. Rio - SP by car is about 5 hours taking the coastal highway.
Roads are very good most of the way from São Paulo to Montevideo - there are some rough stretches in the state of Rio Grande do Sul. We have done this trip by car many times with no problems. I would guess it must be about the same to BA.
However, flying is a much more leisurely choice. And it is less than 3 hours.
Hope this helps. Regards, Susana São Paulo, Brasil