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Barmen is a former industrial metropolis of the region of Bergisches Land, Germany, which merged with four other towns in 1929 with the city of Wuppertal, North Rhine-Westphalia. Barmen was the birthplace of Friedrich Engels and together with the neighbouring town of Elberfeld founded the first electric suspended monorail tramway system, the Schwebebahn floating tram. Barmen was a pioneering centre for both the early industrial revolution on the European mainland, and for the socialist movement and its theory. It was the location of one of the first concentration camps in Nazi Germany, KZ Wuppertal-Barmen, later better known as Kemna concentration camp.
The asteroid 118173 Barmen is named in its honour, celebrating the 1934 Synod which issued the Barmen Declaration defining Protestant opposition to National-Socialist ideology.
Historical population 
|December 1, 1875
|December 1, 1890
|December 1, 1900
|December 1, 1910
|December 1, 1919
|June 16, 1925
Coordinates: 51°16′N 7°12′E / 51.267°N 7.200°E