In 1914, the First World War broke out, and Germany was occupied with war at the homefront. Japan and the United Kingdom took the opportunity and launched the Siege of Tsingtao. The Shantung Railway Syfang General Repair Works was damaged during the siege. In 1915, the Empire of Japan forced the Republic of China government to accept its Twenty-One Demands, which affirmed Japan's takeover of the German territories and railroad assets in Shantung. The Syfang General Repair Works was renamed Shantung Railway Syfang Workshop, which was temporarily managed by the Japanese Army. In March 1915, the Japanese army in Tsingtao established the Shantung Railway Administration, which had five departments: general affairs, transportation, engineering, accounting and mining, and the Tsingtao Workshop. During the Japanese occupation, additional facilities such as sand casting factories, passenger wagon yards, wheel factories, copper casting yards were built, and the number of employees reached more than 1,500.