The Leipzig City Tunnel Cross-section: 2220 mm2 Equivalent copper crosssection: 1400 mm2 Height of profile: 110 mm Lengths of profiles: 10–12 m Mass of profile: 6.1 kg/m Maximum design speed: 140 km/h Spacing between supports: 8–12 m Maximum extension length: 2 x 250 m Electrical voltage: 750 V DC to 25 kV AC Current-carrying capacity: 2640 A Table 1: Proper ties of the overhead contact rail used in the Leipzig City Tunnel Given that the rail itself has a large electrical cross-section, there is no need for any additional conductor in parallel with it to carry some of the current. The conductor rail is positioned without the application of a tensile stress and it is permitted to lose more than 35% of its cross-section through wear before needing replacement, compared with the usual 20% applied to overhead wires. This extends the interval for the replacement of the overhead contact medium. There is an overlap between the catenary and the conductor rail at the tunnel mouths, and trains’ pantographs can run over this smoothly, without suffering jolts. The overlap between individual sections of contact rail is formed by positioning two rails in parallel with their ends raised. 5 Concluding remarks At the time of writing, the work on the tunnel shell has been more or less completed. The impairments experienced by the residents and traders in the centre of Leipzig have thus eased up very considerably. The people of Leipzig are looking forward to completion of the project and to experiencing the advantage of the City Tunnel at first hand. ty Rail (Fig. 7). This design represents an excellent solution for the heavily trafficked City Tunnel with its relatively small crosssection. The conductor rail is comprised of an extruded aluminium sheath supplied in lengths of 10–12 m, connected by means of fishplates on its inside. Any grooved round wire satisfying EN 50149 can be used as the contact wire. Further data is to be found in Table 1. Figure 6 illustrates two different design options. 4 Overhead conductor rail The supply of traction power in both tubes of the Leipzig City Tunnel is by means of roof-mounted power rails from Balfour BeatFig. 7: Overhead conductor rail Fig. 6: Mass-spring system of the heavy design Mass-spring system Arrangement possibilities Pre-design schematic diagram Mass-spring system with higher mass for optimising noise and vibration properties Tubbing shell Slab track Mass-spring system Floor concrete Compendium on ERTMS European Rail Traffic Management System Development · Status quo · Forecast Edited by UIC under the coordination of Peter Winter This new standard work gives an introduction to ERTMS and an overview of the current status, including the consolidation which will follow the formal adoption of new baselines for the ETCS and GSM-R specifications. This compendium offers a complete guide to the complex ERTMS concept, giving an overview on all relevant sub-projects. For more information please visit www.eurailpress.de/ertms! Technical Data: Compendium on ERTMS, ISBN 978-3-7771-0396-9, 256 pages, Size 170 x 240 mm, Price: € 48,– + postage Contact: DVV Media Group GmbH l Eurailpress Telephone: +49 40/2 37 14-440 Fax: +49 40/2 37 14-450
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