Metrorrey Line 4 (Monorail)

Alignment

Line 4 is an elevated straddle-beam monorail that starts at Hospital de Ginecología on Avenida Constitución at Félix U. Gómez, where it shares a station with Line 6. It runs west along Avenida Constitución past Barrio Antiguo, downtown Monterrey, and the Obispado area, then follows part of Avenida San Jerónimo to Pablo González. The state plans for Pablo González to connect with the federal Monterrey–Nuevo Laredo passenger train. The February 2025 plan listed seven stations: Hospital de Ginecología, Palacio Municipal, Pabellón, ISSSTE, Obispado, San Jerónimo, and Pablo González. State and press reports since then also refer to stations at Juárez and Serafín Peña, so the final station list is not settled.

Lines 4 and 6 form one monorail network, with 21 stations across Line 4, Line 6, and Line 6’s airport branch. A Mota-Engil México and CRRC Hong Kong consortium is building the lines under a single contract, with CRRC supplying the trains. The state government’s Secretaría de Movilidad y Planeación Urbana manages construction, and Metrorrey will operate the line.

Updates

2026-11 — Governor inspects Line 4 stations; service targeted for 2027

On November 2, Governor Samuel García toured the Ginecología, Palacio, and Juárez stations on Avenida Constitución, along with related work at Puente Nuevo and Torre Rise. Metrorrey’s director said the state aims to start passenger service on Lines 4 and 6 and the airport branch during 2027, before the current administration ends.

2026-09 — Viaduct for Lines 4 and 6 nearly complete

The state reported 96% overall progress on Lines 4 and 6, with the viaduct at 95.57% and stations at 56.65%. The last beams were being placed, including at the Avenida Gonzalitos crossing, where officials said the work would be done at night and roads would not be closed.

2026-01 — Power supply for the western branch confirmed

During a site visit, Metrorrey’s director said the Y Griega substation, which will also house the central control post, will power both the branch toward the airport and the branch toward Pablo González, the Line 4 terminal that will connect with the Monterrey–Nuevo Laredo train. He said civil works there were practically finished and electromechanical equipment was 70% complete.

2025-12 — Line 4 reaches 75%

The state put Line 4 at 75% complete and Lines 4 and 6 together at 78%. Work included foundations, columns, station platforms, the Avenida Juárez interchange, and Serafín Peña station.

2025-02 — Santa Catarina extension dropped

Governor García said the federally funded extension of Line 4 to Santa Catarina had been cancelled at the federal government’s request, because the planned federal passenger train will serve that corridor. The revised line ends at Pablo González, at 7.62 km with seven stations.

2023-04 — Construction begins

Construction began on April 11, 2023, on a line of just over 7 km from the IMSS Hospital de Ginecología to Pablo A. González, at the edge of Monterrey and San Pedro Garza García.

2022-09 — Contract awarded for Lines 4, 5, and 6

After an international tender launched in April 2022, the state awarded the contract for Lines 4, 5, and 6 to Mota-Engil México and CRRC Hong Kong on September 23, 2022. The bid was about MX$25.86B plus VAT with all three lines elevated. The tender set an August 2027 deadline for construction.