The first tram with overhead lines was presented by Werner von Siemens at the 1881 International Exposition of Electricity in Paris: the installation was removed after that event. In October 1883, the first permanent tram service with overhead lines was on the Mödling and Hinterbrühl Tram in Austria. The trams had bipolar overhead lines, consisting of two U-pipes, in which the pantographs hung and ran like shuttles. From April to June 1882, Siemens had tested a similar system on his Electromote, an early precursor of the trolleybus.