More than a mile of new track has so far been laid by Network Rail contractors, representing the first section of dedicated Crossrail track to be installed anywhere along the route.
Work has included the re-alignment of the existing North Kent line, which serves trains between London and Kent, and the replacement of the Church Manor Way footbridge.
Ahead of Crossrail services beginning in 2018, the tracks will be used to support the fit-out of the new tunnels.
Matthew Steele, Network Rail’s Crossrail programme director, said: “Completing this section of track on time is important because it means that Crossrail can get on with the job of fitting out the new tunnels. Once fully open in 2018, the new tracks will link Abbey Wood to the rest of London like never before, providing local people with a dramatically improved rail service.”