You are looking for a small cache that contains a log and a pencil on the railway infrastructure. It isn't a part of the sculptures but it is a nice spot to visit.
Congrats to SpatialRiq for the *FTF*, finding this cache only 20 minutes after it was published.
The artwork acknowledges the history of this particular site as a railway station and it's role in a line of travel, strongly connected to other places. These sculptures concentrate on the idea of travel forming a visual line that connects the sculptures, with each invoking a destination, being city, beach or other suburban destinations.