For years I've noticed what was clearly a stainless steal European passenger car at Retiro station. It was in poor condition and never seemed to be used. Here's the story of how it and a lot of other rolling stock arrived in Argentina, a tale of intrigue and corruption:
https://www.lanacion.com.ar/1760151-en-via-muerta-la-increible-compra-de-trenes-a-espana-y-portugal
https://www.lanacion.com.ar/1760151-en-via-muerta-la-increible-compra-de-trenes-a-espana-y-portugal
