This is how the corridor of the isthmus of Tehuantepec goes; Train track is 11% advance

The development work of the Isthmus of Tehuantepec, which involves one of the most important offshore and coastal ports in the country, Salina Cruz, had an 11% advance as of September 7. Due to its strategic geographical location, this port represents important operations for world trade and therefore the breakwater that is planned to be built in it is a decisive project for the development of this area, being also a key oil port, which even more, within of its main cargoes are oil and its derivatives as well as bulk products. products mainly destined for ports in the United States and Canada, although it is also the connection with countries such as China and Japan. The work that also involves another vital port for the economic development of the country (Coatzacoalcos) works mainly on topographic research in the region for the laying of roads. 

https://www.milenio.com/negocios/corredor-istmo-tehuantepec-avance-11-via