Written by Dr Aleš Pustovrh – Bogatin, EECFA Slovenia
With the main construction consortium submitting a claim for another EUR 350 million now, the project of Port Koper in Slovenia has again caught public imagination. Despite its 80% readiness, given its past controversies, it is facing scrutiny in its final phase. The second double-track railway line, scheduled for completion in 2026, is set to remove the bottleneck of the existing single-track one between Koper and Divača.

Why such a large-scale railway investment was necessary
Port Koper, Slovenia’s largest seaport, saw consistent growth over the past two decades and evolved into a major logistics gateway for Central and Eastern Europe. In 2024 alone, the port handled approximately 23 million tons of cargo, 3% up from the previous year, while container throughput reached a record 1.13 million TEUs. This performance positions Koper among the leading Adriatic ports, competing closely with Trieste and Rijeka. However, growing volumes of container traffic, vehicle imports, and bulk cargo pushed the port’s capacity toward its limits, particularly due to inadequate inland rail connectivity. The existing single-track railway between Koper and Divača became a major bottleneck, hindering further expansion and reducing overall logistics efficiency.
To enable continued growth, enhance competitiveness, and shift freight from road to rail, the construction of a new, modern double-track railway became essential. The new 27km line is designed to fully replace the existing track and significantly boost capacity—from 90 to 212 train compositions per day—enabling the annual transport of nearly 37 million tons of goods, nearly three times more than before.
An EUR 1.172 billion project
The project is highly complex as it requires significant altitude gain and traverses challenging terrain (20.5km of the new line runs through tunnels and an additional 1.2km over bridges). These engineering challenges have driven up costs considerably. The latest estimate for the project, excluding VAT and calculated at current prices, stands at around EUR 1.172 billion. Project costs have escalated over time.
Initially, in 2010, the project was estimated at around EUR 700 million as a single-track route. Once the plan was changed to a double-track design, costs were expected to rise, but no clear or transparent cost projection was communicated to the public. Combined with an unclear financing structure, this led to growing public concern and political controversy.
As a result, a national referendum was held in which a majority of voters supported the continuation of the project. This decision was later upheld by the Slovenian Supreme Court. To manage the project, the state established a dedicated company, 2TDK, which also implemented a civil oversight and advisory board to address public concerns. A special management and supervision system was introduced to improve transparency and accountability.
Preparations began in 2019, and major works commenced in 2021. Construction is carried out by several prominent companies organized into consortia. The main infrastructure works, including tunnels and viaducts, are executed by a consortium of Kolektor CPG (Slovenia), Yapı Merkezi İnşaat ve Sanayi A.Ş. (Türkiye) and Özaltın İnşaat Ticaret ve Sanayi A.Ş. (Türkiye) on a combined value of roughly EUR 628.3 million.
The final phase of the project, valued at EUR 203.8 million, covers railway system installation including tracks, signaling, telecommunications, electrification, and tunnel equipment, and is handled by another consortium comprising SŽ-Železniško gradbeno podjetje d.d. (Slovenia), Kolektor IGIN d.o.o. (Slovenia), GH Holding d.o.o. (Slovenia) and YM Construction d.o.o. (Slovenia).

Controversies casting a shadow on completion
Although there were occasional public reports of cost overruns and technical challenges during construction, the project remained largely out of the public spotlight until 2025, so this year, when the main construction consortium submitted a claim for an additional EUR 350 million in costs, citing technical difficulties.
Simultaneously, the Civil Oversight Council raised concerns about poor project governance, accusing 2TDK of opaque and inefficient decision-making. The company’s management firmly rejected these accusations. In response, the Minister of Infrastructure, Ms. Alenka Bratušek, visited the construction site and assured the public that 80% of the work had already been completed and that the project would be delivered on schedule by 2026.
Nevertheless, due to past controversies and rising scrutiny, public trust remains cautious, and the project is expected to face increased attention in its final phase.
Segment-level forecast for Slovenia is available in the EECFA Forecast Report. EECFA conducts research on the construction markets of 8 Eastern-European countries, including Slovenia. Orders and sample report






