stylistic:tone, structural:summarization
War and revolution

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 traveling from east to west would delay the arrival of troops or supplies and ammunition in a train traveling 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.

After the Russian Revolution of 1917, the railway served as the vital line of communication for the Czechoslovak Legion and the allied armies that landed troops at Vladivostok during the Siberian Intervention of the Russian Civil War. These forces supported the White Russian government of Admiral Alexander Kolchak, based in Omsk, and White Russian soldiers fighting the Bolsheviks on the Ural front. The intervention was weakened, and ultimately defeated, by partisan fighters who blew up bridges and sections of track, particularly in the volatile region between Krasnoyarsk and Chita.

There was traveling the leader of legions politician Milan Rastislav Stefanik from Moscow to Vladivostok in March and August 1918, on his journey to Japan and United States of America. The Trans-Siberian Railway also played a very direct role during parts of Russia's history, with the Czechoslovak Legion using heavily armed and armored trains to control large amounts of the railway (and of Russia itself) during the Russian Civil War at the end of World War I. As one of the few fighting forces left in the aftermath of the imperial collapse, and before the Red Army took control, the Czechs and Slovaks were able to use their organization and the resources of the railway to establish a temporary zone of control before eventually continuing onwards towards Vladivostok, from where they emigrated back to Czechoslovakia.