[https://www.facebook.com/groups/2360466988/permalink/10153275628516989/ Query link]
'''Answer:''' 1882/1883 OS maps show an unusual amount of signals in the area ([http://maps.nls.uk/view/101594920 1 bottom right], [http://maps.nls.uk/view/101595127 2 top right], [http://maps.nls.uk/view/101595148 3 top left], signals marked "SP"), and the lack of signals in later maps is perhaps linked to the closure of the local ironworks in 1890. Further lines of enquiry being followed up.