However, the Great Depression caused growing budget problems for the Polish State Railways, and completion of the line was questioned.
Under the circumstances, the Polish government decided that the newly created French-Polish Rail Association would take over construction of the middle sector of the line.
Its shareholders were the Polish Bank Gospodarstwa Krajowego and the French Banque des Pays du Nord, as well as industrial giant Schneider et Creusot, which since 1924 had been part of a French–Polish Consortium for construction of the port in Gdynia.
Furthermore, Schneider et Creusot was a shareholder of some Upper Silesian coal mines and steel plants, and for these reasons, the corporation was vividly interested in completion of the line.
The opening ceremony took place at the newly built rail station at Karsznice, and it was broadcast by the Polish Radio.