As a regular user of the London to Whitstable line I have come to notice that, as one increases ones distance from The Great Wen, so increases the number of footpaths crossing the line using wholly uncontrolled crossings.
What I have also noticed by the trackside is a 'W' sign / instruction for the train driver to deploy The Whistle (which in itself is an indicator of the glacial speed at which railway signage has been dragged into The Modern World™) thereby giving anyone on or about to use the crossing, approximately 14 or 15 seconds notice of the train's imminent arrival at said crossing.
This assumes, of course, that the driver is looking for and spots the 'W' sign in the first place.
My friends in Whitstable advise me that the line is frequently closed, due to a 'person on the tracks'.
Sadly, more often than not, the person is there due to tragic, self-inflicted circumstances, rather than carelessness on the crossing.