I recently have been lucky to find a Spanish model on Ebay. It has been made by a company named Electrotren and it is still in existence today in HO gauge product. The O gauge range have been made during a very short time beginning in 1951 near Barcelone and in 1954 the firm changed it's location to Madrid and stopped O gauge products.
Well made model in heavy steel, a classic three rail O gauge but fun to notice that the pantagraph is functional even if Electrotren never produced the system neither tracks which where Paya products.
With the loco was this freight car , maybe a little Marklin inspired of..... but with Spanish markings. A wide range of freight has been produced but they are not easy things to find outside their original country. Except Paya, Spanish models are hard to find, expensive as quantity produced was very low.
Daniel