The Ferrocarril Transístmico (), also known as Ferrocarril del Istmo de Tehuantepec, S.A. de C.V. or simply Ferroistmo, is today a railroad with no rolling stock, owned by the Mexican government, that crosses the Isthmus of Tehuantepec between Puerto Mexico, Veracruz, and Salina Cruz, Oaxaca. It is leased to Ferrocarril del Sureste FERROSUR. It was formerly leased to Ferrocarriles Chiapas-Mayab until Genesee & Wyoming gave up its concession in 2007. Originally it was known as the Tehuantepec Railway. History of the Tehuantepec Railway The potential of the route from the Atlantic to the Pacific across the Isthmus of Tehuantepec has long been appreciated. As early as 1814 the Spanish government authorized a canal across the Isthmus. Soon after Mexico became independent in 1821, surveys were carried out which recommended constructing a plank trail for wagons through the Chivela Pass, with the northernmost part of the route using the Coatzacoalcos River which flows northward to the Gulf of Mexico on the Atlantic side of the isthmus. The river would be dredged to allow navigation. Nothing came of either of these plans. More serious planning began in the early 1840s, when José de Garay, the First Officer of the Ministry of War obtained a concession on the route and carried out a more thorough survey. After many failed attempts to obtain funding, the concession was taken over by a New Orleans company, The Tehuantepec Railroad Company of New Orleans (TRCNO). Despite diplomatic problems over the status of the concession, a further survey of the route was carried out by Major John G. Barnard. This was published in 1852. The years between 1852 and 1861 were turbulent both diplomatically and financially. The opening of the Panama Railroad in 1854 provided competition for the Tehuantepec route, but also gave warning that the TRNCO's cost estimates were wildly optimistic. The Panic of 1857 made raising capital for transportation projects more difficult. There were disputes over the concession with the Mexican Government. In spite of this, the company managed to construct a wagon trail (not a railroad) along the route, and offer a service for passengers and mail from New Orleans to San Francisco, starting in 1858. It was too little too late, however, and the company became insolvent in 1860. The outbreak of the American Civil War and the French intervention in Mexico the following year ended any immediate hope of reviving the project. After