A fifth unit, numbered 1604, was purchased in 1971 from the Burlington Northern Railroad, a piece of surplus Great Northern Railway stock from the 1970 merger that formed the Burlington Northern.
Ferrocarril de Sóller | Ferrocarril de Antofagasta a Bolivia | Ferrocarril General Manuel Belgrano | Ferrocarril Domingo Faustino Sarmiento | Ferrocarril Central Andino |