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In page Kiel:

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Because of its new role as Germany's main naval base, Kiel very quickly increased in size in the following years, from 18,770 in 1864 to about 200,000 in 1910. Much of the old town centre and other surroundings were levelled and redeveloped to provide for the growing city. The Kiel tramway network, opened in 1881, had been enlarged to 10 lines, with a total route length of 40 km (25 mi), before the end of the First World War.[citation needed]