Cellulose train passes through the longest railway bridge in Chile, the bridge over the river Bio-Bio, which connects the cities of San Pedro de la Paz and Concepcion. Leading train, diesel locomotive ALCo RSD30 Reformed and repowered, and ALCo RSD34. This bridge rail, 2 km long, has over 120 years old and has endured great disasters of nature, keeping existing the passage of large freight trains.