- Standard slab track which forms 80 per cent of the track on the new railway – 70 per cent complete;
- Direct fixed track using Australian Delkor two-holed baseplates to reduce dynamic stresses and installed throughout the Victorian Connaught Tunnel – 100 per cent complete;
- High-attenuation sleepers, similar to standard slab track, used in a few areas where noise and vibration need to be kept to a minimum – 25 per cent complete; » Floating track slab light, used to reduce noise and vibration in the Soho area – 50 per cent complete.
- Floating track slab heavy, with a high iron ore content which doubles the density of normal concrete, is being used in the most sensitive areas such as under the Barbican Centre – work just starting.
British Steel is supplying more than 57km of heat- treated, wear-resistant rail. The steel blooms are produced in its Scunthorpe plant but the slight surprise is that these blooms are then transported to Tata’s Hayange mill in northern France to be rolled and finished. Apparently, that’s where the heat-treatment furnaces are. Heavy and light track slab Chris stated that about 64 per cent of the track required in the tunnels has been installed. This is not an easy calculation because there are five different types of track being used, including: