An old photo from the Otago Witness showing the duplication works through Caversham. The line to the left being higher up would probably be the original line which was bypassed. The lines ran close together through Caversham until they deviated off to their respective tunnels. 1907
http://paperspast.natlib.govt.nz/cgi-bin/paperspast?a=d&cl=search&d=OW19071009.2.269.4
