On June 16, 2025, the first technical test of the Interoceanic Train was successfully conducted on Line K, traveling the section between Ixtepec (Oaxaca) and Arriaga (Chiapas), with stops in Juchitán and Unión Hidalgo. The FIT 3014 locomotive led the journey, supervised by the Ministry of the Navy as part of the validation process for the rehabilitated rail system.
The first commercial trip is scheduled for July 5, led by President Claudia Sheinbaum. Line K, extending more than 470 km to Ciudad Hidalgo (border with Guatemala), will strengthen regional integration with Central America. The test generated significant local interest and received additional technical support as far away as Tonalá.
This progress is part of the Isthmus of Tehuantepec Interoceanic Corridor, which seeks to connect the Pacific and Atlantic oceans and boost economic development in southeastern Mexico. Lines Z (Coatzacoalcos–Salina Cruz) and FA (Coatzacoalcos–Palenque) are currently operating. Line K consolidates one of the country's most important railway projects, scheduled for completion in 2026.