Network Rail last week started work to stabilise a large cutting adjacent to Chipping Camden railway tunnel.
The land, which is privately owned and measures around 14,000m2, has moved by nearly 1m in the last eight weeks and has created a scar in the cutting 5m high, posing a risk to the safe operation of the railway.
All lineside equipment has been diverted and monitoring put in place.
Network Rail is seeking formal planning permission to ensure slope stabilisation work, including removing 80,000t of earth, can be carried out to protect the line in the long term.
“We need to stabilise the cutting immediately to protect the railway in the long-term, otherwise we could risk the line being shut from a potential land slip,” said Network Rail Western route asset management director Mike Gallop.