Shadows indicate morning, but not early. I do not remember when the tower was torn down. Joe Collias and I used to call the Gasometers there "Monument Valley".
That same photograph is included in S. Kip Farrington's book, Railroading the Modern Way It is attributed "courtesy of Frisco Lines", an official company photograph. Ken McElreath
S. Kip Farrington should not have been paid to write that book. Or Railroads of the Hour. Just as bad.