Most site operations over the Christmas and New Year period will stop on Thursday December 24 and recommence on Monday January 4.
With the end of the year in sight it's all hands on deck to finalise a number of jobs before the break.
While the majority of the new alignment is located underground, sections of track around High Wycombe Station and the adjacent stowage area, as well as at Bayswater Junction, are located at ground level.
Work on the $1.86 billion Forrestfield-Airport Link is steaming ahead with almost four kilometres of track now laid within the two tunnels of the METRONET line.
Track laying within Tunnel Two (TBM Sandy's tunnel) is advancing on a daily basis, with more than 40 per cent of skeleton track (rail strings clipped to sleepers) in place, and almost 30 per cent of slab track (skeleton track embedded in concrete) complete.