RTR 4/2010 28 The Leipzig City Tunnel the second tunnel tube too. During the tunnelling work, extensive measures were necessary to secure buildings in the city centre of Leipzig, notably in the form of compensation grouting. At the time of writing, all the tunnel shells have been completed for the stations and the ramps. The job of connecting the railway lines through the new tunnel with the existing network began in March 2007 with the removal of some of the existing installations and the erection of the southern flyover. In March 2009, work then commenced on fitting out the more easterly bore of the new tunnel, starting with the insertion of the concrete for the floor, the drainage and the positioning of the shoulders along the edges, including the cable ducts. Laying the concrete floor elements in the western bore started in October 2009 (Fig. 4). The track in both tunnel tubes is scheduled for completion before the end of 2010. 3 Permanent way through the tunnel The form of permanent way chosen for the Leipzig City Tunnel is slab track of the Rheda-2000 type. This is to be combined with various mass-spring or floating-slab systems intended to reduce the vibrations caused by the railway operation. The vibrations caused by train movements are considered in three phases: 1. Emission: excitations caused by the lines are being newly built or rebuilt to give improved passenger access to trains and to enhance the connections for travellers with other forms of transport. 2 Execution of the work The ceremonial cutting of the first sod took place on 9 July 2003. In January 2007, a tunnel-boring machine was set up in the starting trench at Bayerischer Bahnhof (at the southern end of the tunnel section) and started to drive the first railway tunnel. At the end of October 2008, the tunnel-boring machine emerged at the Hauptbahnhof station (at the northern end of the tunnel section), signifying completion of the shell of The platforms are being built with a height of 55 cm and the option of raising this to 76 cm later on. The Hauptbahnhof station on the new line at is to have a usable platform length of 215 m for the long-distance trains that may possibly stop there, whereas the platforms at the other stations are 140 m long. In addition to the work already mentioned, the overall project includes supplementary measures to ensure a properly functioning and expandable system of local public transport as well as minimising the number of conflicts between long-distance trains. One example of this is making it possible for S-Bahn traffic to use tracks that have been reserved for freight trains up until now. Moreover, various stations on the feeder Fig. 3: Semmelweisstrasse station Fig. 2: Layout of the tunnel tubes and stations
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