The path deviates from the railway line after you pass the winding pond (where they had the big steam powered winch to pull the trains up the hill). If you look on Google Earth you can still see where the railway line went. There was a tunnel under Tyler Hill, and you can still see the entrance portals at either end buried in the undergrowth, if you know where to look. Bricked up now, of course. It would be good if they could restore the tunnel one day and make it part of the C&W path - would make the climb out of Canterbury a bit easier.