The permanent track for the Elizabeth line was officially completed today.
The milestone for the £14.8bn project means construction trains can now travel from end to end through both tunnels.
The final piece of track was laid 35m below in the eastbound tunnel of the new Whitechapel Elizabeth line station. Track quality control engineer Ellen McGuinness affixed the final rail clips to the track.
Transport secretary Chris Grayling, deputy mayor for transport Val Shawcross joined Crossrail chairman Sir Terry Morgan and Chief Executive Andrew Wolstenholme to mark the event.