KVAEERNER AND Miller last week became preferred bidders for three of the most complex sections of CTRL section 1.
Formal contracts are expected to be signed in early October once the CTRL rescue is finally agreed.
Miller's Eurolink group has contracts 410 and 305. Contract 410 is the pounds 80M, 3.2km North Downs Tunnel. This joins pounds 30M contract 350, the 1.26km Medway viaduct.
Eurolink's other members are Dumez-GTM of France and Beton und Monierbau of Austria.
Meanwhile, Kvaerner is preferred bidder for the pounds 140M contract 430 which will take the link through Ashford. Work includes constructing 17km of track and building a cut and cover tunnel through Ashford.
The Alfred McAlpine/Amec joint venture has the pounds 70M contract to build a spur from Section 1 to existing track feeding into Waterloo.
Shortlists for contracts 420 and 440 - the last to be tendered - were announced on Tuesday.
Five groups are battling for contract 420 between Boxley and Lenham Heath. They are Taylor Woodrow/Sir Robert McAlpine JV, Bouygues, Track Link (Mowlem/Holzmann/Besix), Hochtief Norwest Holst JV and John Laing.
The five bidders for contract 440 between Ashford and Cheriton are Costain/ Skanska/Amey, Tarmac, Kier-Nuttall JV, CMT Rail Link JV (Christiani & Nielsen/ Morrison/Tilbury Douglas) and Balfour Beatty).