PORR Completes TBM Cradle for CPK Rail Tunnel in Lodz

ŁÓDŹ, Poland – Contractor PORR S.A. completed construction of the concrete support cradle for a tunnel boring machine (TBM) in Łódź following a continuous 24-hour-a-day, three-week engineering operation. The automated machine components have arrived on-site for assembly in the launch chamber ahead of planned excavation in the first quarter of 2027. The project forms a central underground link within Poland’s Centralny Port Komunikacyjny (CPK) national transport programme.

What Is the Full Scope of This Project?

The high-speed rail tunnel in Łódź will carry long-distance passenger traffic beneath the city centre as part of the Y-shaped high-speed line connecting Warsaw, Łódź, Poznań, and Wrocław. The current construction phase centres on assembling the automated shield inside a dedicated launch shaft, supported by an engineered semi-circular concrete bed that prevents trajectory deviations during initial boring. Along the planned underground alignment, crews are constructing intermediate chambers designed for emergency evacuation and ventilation shafts. The total contract value for the specific tunneling drive was not disclosed in the project update.

Key Project Data

How Does This Compare to Similar Projects?

Poland’s rail infrastructure programme matches the scale of adjacent European cross-border corridors while outpacing domestic regional urban transit timelines. The Łódź underground link functions as the core bottleneck-relief corridor for the 480-kilometre CPK high-speed network, running in parallel with the EU-supported Rail Baltica corridor, which spans over 870 kilometres across Poland and the Baltic States targeting completion by 2030 (Source: European Commission / CINEA, 2024). In municipal underground transit, the national government backed the planned Kraków metro in 2026, though that system remains in early design phases compared to Łódź’s advanced shaft readiness (Source: Railway Gazette International, 2026). Globally, large-scale rail connectivity initiatives such as the 530-kilometre China–Kyrgyzstan–Uzbekistan railway broke ground in December 2024 to create new trans-Eurasian freight paths, contrasting with Poland’s passenger-focused European standard-gauge modernization (Source: Jamestown Foundation, 2024).

Editor’s Analysis

Delivering the Łódź subterranean passage is critical to unlocking CPK’s core “Y” line, directly linking Warsaw to western economic hubs without street-level operational conflicts. Poland’s reliance on multiple European engineering teams reflects the technical difficulty of urban shield driving beneath dense historical settlements. Sustained capital allocation under the Connecting Europe Facility indicates that Poland’s long-distance network is transitioning from localized upgrades into an integrated, interoperable high-speed trunk system (Source: Railway Pro, 2024).

FAQ

Q: When will tunnel boring begin on the Łódź high-speed rail tunnel?
A: Excavation by the automated tunnel boring machine is scheduled to start in the first quarter of 2027. Main contractor PORR S.A. is currently assembling the machine components inside the launch chamber in Łódź.

Q: What is the purpose of the concrete cradle completed in the launch shaft?
A: The semi-circular concrete cradle supports the machine’s shield housing to prevent trajectory misalignment during launch. It was cast during a continuous 24-hour-per-day operation over nearly three weeks.

Q: How will the Łódź tunnel integrate into the broader Polish rail network?
A: The tunnel will route high-speed long-distance passenger services under central Łódź as a core link of the CPK line connecting Warsaw, Poznań, and Wrocław. Final commercial service patterns have not been officially confirmed.