4K video of the River Don engine in operation
https://www.youtube.com/watch?v=GmuuLQRe06c
I remember reading that these rolling mill engines were designed to be capable of quick reversing in 2 seconds
(which is seen in the video), to pass the steel blooms from the steel mill repeatedly through the rolling mill, each pass further reducing the thickness to arrive at the intended specification.
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I was little struck by the incongruity of this comment in the Wikipedia entry for the River Don engine: " The engine was last used for commercial work in the 1970s, to roll out reactor shield plates for nuclear power plants" !