The construction of Railway Line 104, Section D between Limanowa and Bocznica Klęczany is one of Poland’s most advanced railway infrastructure projects. Spanning 12.6 km, the project includes 22 engineering structures, a railway station, two stops, and two parallel tunnels, each 3,750 meters long. Built through mountainous terrain and challenging geological conditions, the tunnels are constructed using TBM technology and lined with prefabricated elements, representing engineering solutions not previously implemented in Poland. Dalux connects the two general contractors, Budimex and Gülermak, bringing project documents, design data, correspondence, and 3D models together in one place. The models cover the tunnels, portals, internal infrastructure, and construction site layout, supporting teams in coordinating design changes and construction activities directly on site.