This study represents the technical basis for the definition of the Baltic-Adriatic corridor work plan by the European Coordinator, Prof. Kurt Bodewig, together with Poland, Czech Republic, Slovakia, Austria, Italy and Slovenia, and in consultation with the Corridor Forum. The study defines the corridor as a 1,800 km long intermodal infrastructure between the Baltic and Adriatic basins, interconnecting 13 urban nodes and their airports, 10 maritime and inland waterway ports and about 30 rail-road terminals. Excluding the railway Alpine crossings in Austria the corridor infrastructure is continuous and in operation. Capacity is not a generalised issue at present; congestion may become more critical in the future at urban nodes, and at specific railway sections also depending on the implementation of policies in favour of rail transport. A number of challenges along the corridor are to be faced in terms of its compliance with the different corridor infrastructure parameters of the Regulation (EU) 1315/2013; particularly cross-border sections, last mile connections to nodes and the networks in the cohesion countries require upgrading and modernisation. More than 350 projects have been identified which basically cover the spectrum of the identified critical issues, including full ERTMS deployment, so far not expected until 2030. Cooperation and research & innovation projects should be considered in addition to infrastructure development initiatives for the implementation of interoperable solutions, enhancement of intermodality and removal of operational and administrative barriers.