An important tourist attraction is the narrow-gauge railway (with between the rails), known as "La Trochita" locally and in English as "The Old Patagonian Express" after the book "The Old Patagonian Express" by Paul Theroux. At in length, it is said to be the only narrow-gauge long-distance line in operation and the southernmost railway in the world. The first fifty oil-fired steam locomotives were made by Henschel & Son of Germany in 1922. Later twenty-five locomotives were bought from the Baldwin Locomotive Works of Philadelphia.