The Old Patagonian Express is popularly known as “La Trochita.” Trochita is the common name given to the railway linking Ing. Jacobacchi in the Argentinean province of Rio Negro and Esquel in the Chubut province. Thanks to the novel "The Old Patagonian Express," written by Paul Theroux in 1978, the train became famous internationally. . The word “trocha” refers to the track gauge of 750mm used on this railway, one of the narrowest in the world. Planned as part of a broader rail network that would link much of southern Argentina, the Trochita belongs administratively to the General Roca Railroad Network in Southern Argentina. The line has become a tourist attraction because of the steam locomotives that run its 402-km line between Ing Jacobacci and Esquel. In 1998, the Argentinean Government declared the railway a National Historic Monument.