Berlin’s New JK Trains: Stadler Modernization Project

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Introduction

The Berlin Transport Company (BVG) launched passenger operations with new JK series trains from Stadler on the U2 line in Berlin on September 8, 2025, as part of a fleet modernization program. The framework agreement with Stadler allows for the delivery of up to 1,500 new railcars by 2035, involving a total investment of up to €3bn.

New Train Introduction

The new JK series train model, designed for the U1 to U4 lines, represents the first new train model introduced by BVG in a decade. The inaugural journey of the JK series took place on the U2 line. BVG plans to integrate up to 140 new railcars from Stadler into its fleet by the end of the year.

Fleet Modernization Strategy

The fleet renewal is a central element of BVG’s “stability before growth” strategy, which aims to achieve a reliability level of 99% in the coming years. The new trains are designed to contribute to this goal through technical stability, spacious interiors, modern information systems, and improved accessibility. Testing and measurement runs were conducted as part of the approval process. Operational preparations included training for drivers and workshop personnel.

Financial and Operational Details

The framework agreement with Stadler permits the delivery of up to 1,500 new railcars by 2035, with a total investment of up to €3bn ($3.5bn). Currently, BVG has ordered 484 railcars from Stadler’s JK and J series, which will serve the U1 to U4 and U5 to U9 lines, respectively. The state of Berlin is financing the new vehicles as part of its transport contract with BVG. The wider J series is currently undergoing trial operations and is expected to enter passenger service next summer.

Stadler’s Involvement

Stadler Germany Division CEO Jure Mikolcic stated that the maiden voyage marked an important milestone in the partnership with BVG. Recently, Stadler’s TINA trams began trial operations on the Halle transport network, managed by Hallesche Verkehrs (HAVAG), a subsidiary of Stadtwerke Halle-Gruppe in Germany. The initial phase features an MGT-XL tram operating on lines 1, 2, and 3 in Halle (Saale) for three months.

Conclusion

BVG has commenced passenger operations with the new JK series trains from Stadler on the U2 line in Berlin. The framework agreement allows for the delivery of up to 1,500 new railcars by 2035, with an investment of up to €3bn. The new trains are part of a fleet modernization strategy to improve service reliability.

Company Summary

BVG: The Berlin Transport Company, responsible for public transport in Berlin.

Stadler: A manufacturer of railway rolling stock.

HAVAG: Hallesche Verkehrs, a subsidiary of Stadtwerke Halle-Gruppe in Germany, manages the Halle transport network.

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