To speed up the construction works, the Polish government in November 1924 signed a contract with the French-Polish Consortium for Gdynia Seaport Construction. By the end of 1925, they had built a small seven-metre-deep harbour, the south pier, part of the north pier, a railway, and had ordered the trans-shipment equipment. The works were going more slowly than expected, however. They accelerated only after May 1926, because of an increase in Polish exports by sea, economic prosperity, the outbreak of the German–Polish trade war which reverted most Polish international trade to sea routes, and thanks to the personal engagement of Eugeniusz Kwiatkowski, Polish Minister of Industry and Trade (also responsible for the construction of Centralny Okręg Przemysłowy). By the end of 1930 docks, piers, breakwaters, and many auxiliary and industrial installations were constructed (such as depots, trans-shipment equipment, and a rice processing factory) or started (such as a large cold store).