Area 100 comprises some of the most complex rail interfaces on the entire project. The area just north of St Pancras International was already extremely congested with existing railway infrastructure, namely the Midland Main Line (MML), North London Line (NLL), North London Incline, Moorgate Line and the East Coast Main Line (ECML).
Railway works have followed on behind a £107M package of civil works executed by Kier/Nuttall joint venture. This included the construction of three new concrete viaducts, extensive earthworks, realignment of a major road, York Way, which crosses the CTRL trace, and the construction of several new bridges, including a push launched crossing of the ECML to tie St Pancras with the London tunnels.
Though in themselves the structures are structurally straight forward, they have been constructed in a tightly constrained site, tight up against operational railways.
'The physical difculties of getting plant and equipment to site as well as the complex interfaces with both the civil and station contracts has been tough, ' says RLE railway project manager Neil Winterburn. The £115M of rail work was awarded as three separate contracts to Mowlem Railways, Westinghouse and Thales, with RLE acting as project manager.
'Now we have moved MML into their nal home, we can finalise the CTRL approaches and throat, ' says Winterburn. After five years of intensive work, the focus is now on completing the principal CTRL works across the King's Cross Lands by mid-December. Systems and the 25Kv traction power are to be commissioned by February 2007.