Late to the 'game' here, but my grandfather worked for Edward Gray, Highland Park plant's chief engineer, from 1910 to 1914 or 1915. I have one photo of the craneway during that time also. Grandpa was an employee of Gray at Riverside Engine in Oil City, from which the first three power plants for Highland Park were built. Edward Gray designed the next six as well although those were built by a different firm in Ohio. I have a photo of their home in Highland Park as well, 31 Stevens, which still stands today [[or at least the last 'Google Road' tour).
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