From 15 August 1903, overhead electrification with AC power (6 kV, 25 Hz) was tested on the line by the company Union-Elektricitäts-Gesellschaft (UEG), which merged the following year with AEG.
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On the other side, there was a loading facility for VEB Müllabfuhr (the state waste-disposal company).
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Parallel with the trials on the Spindlersfeld line, tests were carried out by AEG and Siemens & Halske, under a joint venture called Studiengesellschaft für Elektrische Schnellbahnen, with AC on the Royal Prussian Military Railway (Königlich Preußische Militär-Eisenbahn) between Marienfelde and Zossen.
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