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I have one that's similar. It fits a 5" nut and weighs about 50 lbs. The railway ran through the farm where my family lived from the 1860s to early 1970s. My father said that the railway workers would sometimes hide extra tools in our barn when the inspector came around so he wouldn't take them for other crews. I think that's how we ended up with it. My uncle told me that he remembered the crews using this wrench, with a long sleeve to extend the handle, on the nuts of steam engine wheels.
They used to use one like that on big Caterpillars and probably other makes and models. It was used to take slack the out of the track. Later they used a hydraulic cylinder and pumped grease in it, Much easier. IIRC it was about 4' long and the opening was about 4", I never used one but I remember seeing them.
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