The development concerned construction works covering a task named “Desigining and conducting construction works aimed at permanent protection of the railroad fill on the railway line No. 009 on the sections between Warszawa Wschodnia Osobowa and Gdańsk Główny in tracks No. 1 and 2 from km 304.700 to km 305.000” The works included a demolition of the existing fill on the section of 350 m, base reinforcement and reconstruction of the fill with chemically stabilised soils including a reconstruction of the structural layers of the rail bed.