McGurk who provided this photo adds:
Trams and Buses
"My dad took this photo when they were
taking up the old tram lines. Most of those buses were pretty new,
although some buses ran concurrently with the trams.
Notice the people standing at the bus stop -
this must be a temporary stop, as it's in what was normally the middle of
Ally McGurk, May 25, 2007
This photo was taken in June 1956. I believe that trams continued
to run along Princes Street until September 11, 1956. So the queue
in the middle of the road may well have been a tram queue.
The buses appear to be on the 'wrong side' of Princes Street.
The explanation is that resurfacing work began in Princes Street on
March 1, 1956, and while this was being carried out a one-way system
operated. for all traffic in Princes Street (except trams), the eastbound
traffic using George Street and westbound using Princes Street between
Charlotte Square and St Andrew Square. ['Edinburgh's Transport,
The Corporation Years': DLG Hunter]