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There was a variation on the pinch bar that we used when I worked in a chemical plant in the middle 1970's to the mid-1980's. It was called a pole jack, or at least that's what we called it. Of course, we also had some other names for them, but repeating those would get me in trouble with Bergie. The "business end" was basically a three piece assembly. there was a steel saddle with a pair of square knives that rested on top of the rail. The knives would "bite" into the rail to keep the thing from slipping. Pivoted to the saddle was lever with a pivoted shoe that pushed against the wheel near the point where the wheel and railhead touched. The "stupid end" consisted of a large, heavy wooden handle, about six feet long that attached to the steel lever that pivoted on the saddle. They worked pretty well on empty cars when we needed to move them just a bit to spot for loading, but moving a load was work! They did the same thing as a pinch bar, but provided a bit more mechanical advantage. It did take two men to move a car if there was any deviation from perfectly level that would cause the car to want to roll backward.
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