The Settle-Carlisle line has been closed again due to the threat of further landslips.
It is now expected to be shut for weeks.
Network Rail had partially reopened the route yesterday.
However its ground measurements have now detected further movement of a railway embankment at Eden Brow, near Appleby.
Martin Frobisher, Network Rails route managing director, said: ... "Since movement of the embankment was first detected by aerial monitoring, we have had a team of experts on site to monitor conditions and to measure ground movement.
"This team measured significant movement of the embankment overnight and we have needed to close the line.
"Major repairs are needed and the line is likely to be shut for many weeks while these take place.