Overview
- The federal audit office reported deficiencies in technical documentation and oversight on Line Z and issued pliegos de observación that presume possible damage to public funds pending clarification or recovery.
- Audit tallies cited more than 33.6 million pesos in potential losses from 2020–2023, including 28.8 million pesos in excess payments in 2023 and anomalies such as overpaid ballast and heavier rails billed than installed.
- One contract for the Ubero–Mogoñé stretch included a 187.9 million peso advance despite no documented start of works, according to audit records.
- The passenger train derailed between Nizanda and Chivela, leaving 13 dead and 98 injured in a corridor known for tight 9–12 degree curves and grades up to 2.2% across roughly 56 kilometers that constrain operations.
- EL CEO reported that Comsa Infraestructuras worked from kilometer Z-228 to Z-243, covering the area near the Z-230 accident point, that the contract was later removed from the transparency portal, and that supervision was assigned to Stratega P y S, a firm previously cited in SFP probes.