Thanks for information about the quarry in Oamaru and your family connection. The gully is still called Rifle Butts but also Lime Kiln gully and The Glen.
It has another heritage site at the top, where a very shelly and crumbly limestone was quarried for Chicken Grit. It has now been filled in for its protection but it's still a protected geological site.
Hello Bruce ...My Great great grand father James May leased all this land of the council in the late 1800's.He was a stonemason /builder not sure what he did up here .I do know He put the rifle butts in.
think your train is lost