Southeastern tweeted yesterday to say work at Bearsted is ahead of schedule.
It comes as Network Rail revealed the cutting is so steep, teams attached to harnesses and ropes had to descend the embankment to examine the damage.
The track has been out of action all weekend with a rail replacement bus service running between Maidstone East and Ashford.
Southeastern said tickets are alternatively valid on Stagecoach bus route 10x, which serves the two towns.
Passengers have also been thanked for their patience.