20,000 tonnes of rock is being packed onto the banks of the River Eden, to help protect the Carlisle to Settle railway line.
The line was forced to close for more than a year in February 2016.
It's part of the final phase of £23million repair works, described as the most complex and largest railway repair in Network Rail's history.
The rocks on the river banks will guard against erosion caused by heavy rainfall.
The line reopened in March this year, after more than a year of work to secure a vast concrete track base into the steeply-sloping bedrock of the Eden gorge.
Silt booms and new drains have also been installed into the foot of the embankment.
The final phase of the Eden Brows repair is set to be completed in March 2018.