Thank you to Peter Rivet for the following bit of detective work.
"I don't think this photo can relate to the
original installation of track for the cable trams in 1888. Instead, it
shows the relaying of the track which took place c.1923 for the electric
trams which replaced them.
D L G Hunter states in his book that the
condition of the track on the two original cable car routes was such that
it needed complete replacement, and buses had to be run while it was in
Evidence for this date is provided by the
style of dress of the workmen (compare it with the other photos) and the
fact that they have a power drill to assist them with their work.
Also in the background you can see an electric
street lamp - this would not have appeared until the late 1890s."
Peter Rivet October 6, 2007