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At the beginning of the 20th century, the exceptional railway situation of Chambéry led the PLM railway company to build a rotunda, inspired by the metal architecture of Gustave Eiffel. While the first rotundas could house 16 to 24 locomotives with a diameter of 54 meters, the rotunda of Chambery is the largest ever built with its 108 meters of interior diameter, it covers 36 radiating tracks and allows the storage of 72 locomotives, with a mass of more than 900 tons. The metal frame consists of a 27 meter annular part and a 55 meter dome resting on 18 pillars and each pillar is articulated on a ball joint. The roundhouse was delivered at the end of 1910 and put into operation in 1911. During the Great War, coal restrictions encouraged the railways to develop electric traction and the Chambery-Modane line was chosen to serve as a test. On July 16, 1929, the 262 AE2 electric locomotive was delivered to the Chambery depot, the first of 4 in the series intended for traction of fast trains; it would be the most powerful electric locomotive in the world at the time. On January 1, 1938, the date of the creation of the SNCF, the series of 262 AE became the 2CC2 3401 to 3404, they remained in service between Chambery and Modane until 1974. On May 26, 1944, the city of Chambery and the railway installations were bombed by the Americans in order to prevent German troops from retreating to Italy, the destruction was massive but the Rotonde was not too damaged, the restoration of the metal frame began in July 1944, the steam workshop found its roof on March 2, 1948 and the Rotonde regained its original appearance in October 1948. Some railway workers, convinced of the interest of the building, will make the management of the SNCF aware of the conservation of this precious industrial testimony, in 1984 the rotunda of Chambéry was included in the supplementary inventory of Historic Monuments. Completely restored between 1997 and 2009, this roundhouse is still used today for the maintenance and rapid garage of around 50 daily locomotives. Links: http://www.railsavoie.fr/ http://www.apmfs.fr/