I suspect the 4015 had just recently received the addition of an extended vision window right here at this location, at Parson's Yard in Columbus, OH. Perhaps the one on the ground to the side of her pilot was for the opposite side?

Photographed by John A. Taylor, April 22, 1987.
Added to the photo archive by John A. Taylor, October 2, 2022.
Railroad: Chessie.

John A. Taylor's awards:

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