In the Russo-Japanese War (1904–1905), the strategic importance and limitations of the Trans-Siberian Railway contributed to Russia's defeat in the war. As the line was single track, transit was slower as trains had to wait in crossing sidings for opposing trains to cross. This limited the capacity of the line and increased transit times. A troop train or a train carrying injured personnel travelling from east to west would delay the arrival of troops or supplies and ammunition in a train travelling from west to east. The supply difficulties meant the Russian forces had limited troops and supplies while Japanese forces with shorter lines of communication were able to attack and advance.