Forest train UO - TH 50.074 of FEPASA railroad crosses the massive Malleco Viaduct, railway bridge passing over the Malleco River valley in the AraucanÃa Region. Opened October 26, 1890, has completed 130 years, remaining fully current and in operation. Its height is 102 meters (334,6 ft), and its length is 348 meters (380,6 yd).