Follow railway (5)
I believe the answer is:
track
I believe this clue is a double definition.
'follow' is the first definition.
(I've seen this in another clue)
'railway' is the second definition.
(thesaurus)
(Other definitions for track that I've seen before include "Single item on a CD" , "Pathway" , "Shadow" , "racecourse" , "Rough path or road" .)