I cant actually see any line.
Google Earth does not show a currently used line,
However, Wikipedia suggests it (with Linton Station) was the Stour Valley Railway which ran from Shelford to Marks Tey which closed in 1967, leaving only the section from Sudbury to Marks Tey still in use.
This may be of interest:
http://www.disused-stations.org.uk/l/linton/