Clipping of a graph of horsepower for T&P train #610. There are two curves, one to indicate cylinder horsepower, another to indicate drawbar horsepower. Written below the image are "Aug. 20th 1977" and "-Trains Feb 1978 pg."
[Graph of Horsepower Curves for T&P Train #610],
accessed March 5, 2020),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting The Grace Museum.