This Chilean commemorative stamp, issued in 1951, marks the 100th anniversary of the first railway line in South America, running from Copiapó to Caldera (1851). The design features the historic “Copiapó” steam locomotive engraved in rich red, presenting excellent line detail typical of mid-century Chilean printing. Issued at the 1 Peso denomination, the stamp appeals strongly to collectors of railway history and early industrial transportation. Its clean layout, classic serif lettering, and sharp impression make it a desirable item in thematic collections. Well-preserved examples remain sought after in both Latin American and railway-themed philately.