Whilst travelling on the Chessington branch on Saturday I noticed small yellow numbered markers stuck into the ground lineside, which appeared to be "chainposts" (as the ones either side of a 1/2 mile post were 39 and 41). Where I first noticed them they appeared to be at one chain intervals; at other places they appeared to be at 5 chain intervals. Are these a) standard [not aware of ever seeing them elsewhere!] and b) permanent - or are they only there in connection with some kind of works taking place (if so, what and why?)?
Thanks in advance to anyone who can provide information
Thanks in advance to anyone who can provide information