The UK's Crossrail has released tenders worth £400m for a track and tunnel equipment design contract as part of the London rail link.
The 21km twin-bore tunnel, which will span central London and the Docklands, is scheduled for completion by late 2014.
Crossrail is also seeking bidders for fit out the new rail tunnel; the work comprises installation of over 40km of track, overhead electric conductor rails to power the trains and ventilation and drainage systems.
The new Crossrail tunnels will also require over 50 ventilation fans, 40km of walkways, 60 drainage pumps and 30km of fire mains, as well as lighting throughout the entire length.
The fit-out works will be carried out in the tunnel section between Royal Oak, Pudding Mill Lane and Plumstead.
The contract for the fit-out will be awarded in late 2012 while work will start in 2014 for completion in 2018.