East slope of Horseshoe Curve on Track 1 are two PC SD-40's helper set with clear stacks pushing up grade in notch 8. On Track 4, long freight power braking down hill creating a lot of brake shoe smoke/dust. Camera and face got a little dirty leading up to this shot.

Photographed by Bruce Nelson, June 10, 1970.
Added to the photo archive by Bruce Nelson, September 24, 2023.
Railroad: Penn Central.

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