Overview
- A presidential and city‑government inspection on Sunday, Aug. 23, showed Line 4 at roughly 20% complete and set a goal of about 40% progress by December 2026 en route to finishing in December 2027.
- The Tlalpan–Metro Universidad route will run about 11.4 kilometers with nine stations, more than 70 support towers and roughly 390–400 cabins to serve an initial 65,000 daily riders and a potential 155,000 residents across 44 neighborhoods.
- The federal government has allocated 4,700 million pesos for Line 4 as part of a three‑line expansion that totals nearly 40 km and over 17,000 million pesos in planned investment.
- Technical work is advanced and concrete foundations are under way with 13 footings completed and the first tower installed, but engineers must use special pile and injection techniques to work in volcanic and fractured basalt soils.
- Environmental permits require mitigation measures including the removal of 16 trees, transplanting 246 and pruning 144, and separate legal challenges and local disputes over siting—notably on Line 5—remain active and could affect the wider program.