Geotechnical specialists and engineers are among an 80-strong team still to decide on the best way to tackle the mammoth landslip that closed the railway in Cumbria two weeks ago.
Network Rail said extensive preparatory works were underway ahead of repairs to the Settle-to-Carlisle line at Eden Brows.
New Civil Engineer reported earlier this month that the incident near Armathwaite on the Settle-to-Carlisle line involved about 500,000t of earth and an area 130m by 70m.
At the start of an intensive campaign to overcome the landslip, access roads are being built across farmland; a site compound is being set up; vegetation is being removed; and soil samples are being taken.
Network Rail has warned that the line is likely to remain closed north of Appleby for “several months”.
Network Rail project manager Rhiannon Price said this week: “Around 500,000t of earth in the embankment supporting the railway is still on the move downhill towards the River Eden.
“Since our monitoring systems detected significant movement on 9 February our geotechnical and engineering experts have been considering all the possible repair options. We have not yet agreed on the best final engineering solution but we hope to have that soon.”