. The Street railway journal . 38 39 10 10 11Marlenfelde Street Ru. Journal ZOSSEN CURVES, AT 207 KM PER HOUR train consisting of one motor car and four trailers running at150 km to 200 km (90 miles to 120 miles) an hour, would re-quire during the acceleration period 2000 kw to 3000 kw; thatis, 2000 amps, to 3000 amps, at 1000 volts, direct-current. Atthis comparatively low voltage the current collector would, ofcourse, have to be very heavy. The recognition of this difficulty in operating high-speedlines by direct-current, led Wilhelm von Siemens to suggest, in Trip 3 on November 10
. The Street railway journal . 38 39 10 10 11Marlenfelde Street Ru. Journal ZOSSEN CURVES, AT 207 KM PER HOUR train consisting of one motor car and four trailers running at150 km to 200 km (90 miles to 120 miles) an hour, would re-quire during the acceleration period 2000 kw to 3000 kw; thatis, 2000 amps, to 3000 amps, at 1000 volts, direct-current. Atthis comparatively low voltage the current collector would, ofcourse, have to be very heavy. The recognition of this difficulty in operating high-speedlines by direct-current, led Wilhelm von Siemens to suggest, in Trip 3 on November 107 8 Marienfelde ZOSSEN CURVES, AT 210 KM PER HOUR 11 10 20 Zossen . Journal 1897, the use of high-tension alternating current. Followingthe Siemens-Halske Companys experiments at Lichterfelde in1897, a high-tension three-phase equipment was built for theMarienfelde-Zossen tests, which began in 1901. As is wellknown, the early trials proved the electrical apparatus to an-swer all requirements, but it was found necessary to strengthenthe roadbed. In 1903 the experiments were renewed, beginning with speedsof 145 km (87 miles) and finally reaching 210 km (126 miles)per hour. When the car attained a speed of 175 km (105 miles)per hour, it was found that the weight and lack of elasticity of the current collectors induced considerable swaying of thepower wires, causing serious interruption in the collection ofcurrent. Several changes were therefore made in the designof these collectors, so that it became possible to collect as muchas 2500 kw, although the pressure of the current collectors
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
