There was controversy, in the years leading up to 1922, over whether or
not it would be acceptable to run electric trams along Princes Street.
It was feared that the overhead cables would detract from the view looking
towards Edinburgh Castle from Princes Street.
The photograph below (with overhead tramlines later drawn in) was used
to demonstrate how the wires might appear.
After considerable debate, it was agreed that electric trams could run
along Princes Street. Ornate poles were constructed to support the
tram wires. The large picture above shows one of these poles in
Princes Street, close to the Scott Monument.