The end post, complete with a couple of radiseurs is beside a bridge that carried the railway over a canal spillway.
It must have been a pain threading the wire through a line of these posts unless there was somekind of spigot between the two siides which is why I thought they mat be cast. There is nought but surface rust which also suggests cast iron to me. I didn't see any more posts. The line belonged to the Lanarkshire & Dumbarton Railway in the late 1800s.
Just noticed something interesting on old-maps. The second basin currently has a pair of gates across the towpath that say" Bowling Basin 1950 ". The basin is shown on the 1898 1:2500 map - i wonder where the date 1950 came from? It is somewhat misleading!