Engineers from Network Rail who have been working on a line which closed following a landslip said they have also been protecting wildlife as they carried out the works.
The line between Dorking, in Surrey, and Horsham, in West Sussex, shut on 23 January after the track was affected by a landslip near Ockley.
The site is home to protected species, including dormice and great crested newts, many of which are hibernating.
Engineers worked with Natural England to make sure the animals were not disturbed or moved while the works were taking place.