PRCo Logo

[Jim Holland]

Greetings!

	Does anyone know what year the PRCo Logo of Initials with Wings, 
located below the windows and behind the center doors, was first applied 
to the streetcars?  The earliest photo I could find with this logo was 
the summer of 1956; other photos in the same time frame show cars without 
the logo.
	What was the diameter of the circle containing the letters?

James B. Holland
------- -- ---------
        Pittsburgh Railways Company (PRCo), June of 1949 -- June of 1953
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