As a kid, growing up in Northeast Philly and visiting family in maple Shade, New Jersey, we would always take the Tacony-Palmyra bridge. Many times a GG1 pulling a passenger train passed over us as we went under the PRR bridge before entering the Tacony-Palmyra approach. It wasn't until 1978 that I took my trusty SLR camera down to the tracks just south of the T P bridge and photographed GG1s pulling passenger and freight trains. I can still feel the excitement as I stood maybe ten feet away from the tracks and a PC painted G roared by. The ground seemed to shake as my adrenaline spiked. What a thrilling experience.
Here are two pictures I took that year. Both were slides that I transferred to the computer. The slides had been in storage in my attic and their quality deteriorated a bit. First is 4935. Second is a GG1 in PC livery.