Crossrail’s major tunnelling works are scheduled to be complete by spring 2015 when tunnelling machines Elizabeth and Victoria reach Farringdon.
Eight 1,000 tonne tunnelling machines have bored more than 39km of new 6.2m diameter rail tunnels under London.
Construction is also advancing on the 10 new Crossrail stations and on works above ground west of Paddington and east of Stratford.
Following completion of the tunnelling, the focus will then shift towards fit-out and implementing railway systems within the tunnels and stations.
Andrew Wolstenholme, Crossrail chief executive, said: “Crossrail is being delivered on time and within budget. While we are over 60% complete there is still a huge amount of work to be undertaken as the challenge shifts to the complicated and substantial task of fitting out the stations and tunnels with the necessary systems and equipment to enable Crossrail services to operate.”