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found this "rail saw" for a cutting demo: http://www.youtube.com/watch?v=yoYBFrJDrlI&feature=related But I'm pretty sure that the ones I saw on the rail-road in my town hadn't any clamp. Longer body for the blade too. Only free handling. Not obvious to cut those thick steel bars without jamming...

The railroad crews cut the rails on the field with it. Big abrasive blade, like those small ones on our angle-grinders, but thin and all flat. One blade per cut it seems.