I don t think Argentina has an agency for this purpose although I could be wrong Traditionally civil law countries seem to have regarded accident investigations as the responsibility of the investigating judge see also Inquisitorial system there might also be a technical investigation internal to the railway company but no report would be published This has begun to change in Europe in recent years so that most or all countries now seem to have independent technical investigations with published reports operating in parallel with the criminal investigation but I m not sure whether any non European countries have gone in that direction The position is different for aviation because there are international agreements e g the Convention on International Civil Aviation governing the area