The complaint concerns the negative impacts on the environment of the “Divača-Koper second rail track” project. The project consists of the construction of 27 km of single-track railway line on a new alignment to increase rail capacity between the port of Koper and the rail junction in Divača in Slovenia. In March 2021, the EIB Group Complaints Mechanism (EIB-CM) issued an initial assessment report establishing the following allegations: allegation (1) regarding the project’s negative impacts on the environment and non-compliance with EU environmental law (Strategic Environmental Assessment, Environmental Impact Assessment, Habitats and Water Framework Directives, and issues with transboundary consultations), and allegation (2) regarding the fact that the scope of the 2TDK Divača-Koper project as approved by the EIB (a single-track railway line with service tunnels) differs from the actual scope of the 2TIR Divača-Koper investment programme (a double-track railway line).