Castro Barros is a station on Line A of the Buenos Aires Metro. The station was opened on 1 April 1914 as part of the extension of the line from Plaza Miserere to Río de Janeiro.
Wikipedia https://en.wikipedia.org/wiki/Castro_Barros_(Buenos_Aires_Underground)
Address 4 Calle Castro Barros, Ciudad Autónoma de Buenos Aires C1178AAB, Argentina
Coordinates -34°36'42.142" N -58°25'17.464" E