Being somewhat of a trolley fan, I can narrow the timeframe of this photo a little.
PCC #4066 is one of the postwar cars and was part of a group delivered between
September 1946 and March 1947. The easiest spotting feature of the postwar cars
are the standee windows, which were not present on the pre-war cars. Another item
helping to date the photo is the Solvey Coke sign in the background. A photo I came
across, dated April 1954, shows this sign had been changed to Sahara Coal. So the
timeframe is firmly set between late '46 and early '54 (probably at least a little earlier
as I can't imagine anyone repainting that sign in Winter or early Spring).
As a guess I'd say late '40s because of the autos, as previously pointed out. Not a new
looking one in the bunch.