Milestone

Webuild completes final tunnel breakthrough on Lima Metro Line 4

By Staff Writer  |  27 October 2026

Webuild and its consortium partners have completed the final tunnel breakthrough planned on the section of Line 4 of Metro de Lima, after tunnel boring machine Micaela reached Carmen de la Legua Station.

Webuild announced the breakthrough on 23 October 2026. Carmen de la Legua Station will be the future interchange between Lines 2 and 4, and the arrival of TBM Micaela completes the excavation work planned along the Line 4 section. The President of Peru, Keiko Fujimori, and the Minister of Transport and Communications, Angello Tangherlini, attended the official ceremony.

The tunnelling

Working with a second machine, TBM Delia, Micaela has excavated more than 20 kilometres of tunnels under the city. Carmen de la Legua is the eighth and final station on the Line 4 section. The machine will now move to a shaft, where it is expected to arrive in November to be dismantled.

The Line 4 breakthrough follows the completion of tunnelling on Line 2. On 13 July 2026 Webuild announced that, with the breakthrough of the final diaphragm wall at Station 4, it and its partners had completed the 27 kilometres of tunnels planned for that route. The two machines used on the project each have a cutterhead more than 10 metres in diameter and worked at depths of more than 12 metres below the streets.

The project

The works were commissioned by Peru's Ministry of Transport and Communications. Webuild is delivering the project in consortium with European and local partners, and the contract covers the construction and operation under concession of Line 2 and a section of Line 4. The two lines total 35 kilometres: 27 kilometres on Line 2 and 8 kilometres on the Line 4 section. According to Webuild, the project also includes 35 stations, 36 ventilation and emergency shafts and two rail depots.

Line 2 runs along the main transport corridor linking the districts of Ate and Callao, connecting the east of Lima with Peru's largest port and Jorge Chávez International Airport. Once complete, the lines will cross 10 districts and connect the port and industrial area of Callao with the centre of the capital and its main residential, industrial and logistics areas.

Webuild says the lines will cut travel time between Ate and Callao from two hours and 45 minutes to 45 minutes. They will give Metro de Lima its first underground service.

What comes next

With tunnelling on Line 2 finished, Webuild said in July that work on that line was moving to track-laying, the installation of technological and operating systems, and the completion of the stations.

Webuild reports that it has built more than 890 kilometres of metro systems worldwide. Its current urban rail work includes the Grand Paris Express Line 15 West in France, Sydney Metro Western Sydney International Airport and the Suburban Rail Loop East in Melbourne, together with Rome Metro Line C and the Capodichino Station on Naples Metro Line 1 in Italy.