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 for Edge rail
From The Collaborative International Dictionary of English v.0.48 :

  Edge \Edge\ ([e^]j), n. [OE. eg, egge, AS. ecg; akin to OHG.
     ekka, G. ecke, Icel. & Sw. egg, Dan. eg, and to L. acies, Gr.
     'akh` point, Skr. a[,c]ri edge. [root]1. Cf. Egg, v. t.,
     Eager, Ear spike of corn, Acute.]
     1. The thin cutting side of the blade of an instrument; as,
        the edge of an ax, knife, sword, or scythe. Hence,
        (figuratively), That which cuts as an edge does, or wounds
        deeply, etc.
        [1913 Webster]
              He which hath the sharp sword with two edges. --Rev.
                                                    ii. 12.
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              Whose edge is sharper than the sword. --Shak.
        [1913 Webster]
     2. Any sharp terminating border; a margin; a brink; extreme
        verge; as, the edge of a table, a precipice.
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              Upon the edge of yonder coppice.      --Shak.
        [1913 Webster]
              In worst extremes, and on the perilous edge
              Of battle.                            --Milton.
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              Pursue even to the very edge of destruction. --Sir
                                                    W. Scott.
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     3. Sharpness; readiness or fitness to cut; keenness;
        intenseness of desire.
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              The full edge of our indignation.     --Sir W.
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              Death and persecution lose all the ill that they can
              have, if we do not set an edge upon them by our
              fears and by our vices.               --Jer. Taylor.
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     4. The border or part adjacent to the line of division; the
        beginning or early part; as, in the edge of evening. "On
        the edge of winter." --Milton.
        [1913 Webster]
     Edge joint (Carp.), a joint formed by two edges making a
     Edge mill, a crushing or grinding mill in which stones roll
        around on their edges, on a level circular bed; -- used
        for ore, and as an oil mill. Called also Chilian mill.
     Edge molding (Arch.), a molding whose section is made up of
        two curves meeting in an angle.
     Edge plane.
        (a) (Carp.) A plane for edging boards.
        (b) (Shoemaking) A plane for edging soles.
     Edge play, a kind of swordplay in which backswords or
        cutlasses are used, and the edge, rather than the point,
        is employed.
     Edge rail. (Railroad)
        (a) A rail set on edge; -- applied to a rail of more depth
            than width.
        (b) A guard rail by the side of the main rail at a switch.
     Edge railway, a railway having the rails set on edge.
     Edge stone, a curbstone.
     Edge tool.
        (a) Any tool or instrument having a sharp edge intended
            for cutting.
        (b) A tool for forming or dressing an edge; an edging
     To be on edge,
        (a) to be eager, impatient, or anxious.
        (b) to be irritable or nervous.
     on edge,
        (a) See to be on edge.
        (b) See to set the teeth on edge.
     To set the teeth on edge,
        (a) to cause a disagreeable tingling sensation in the
            teeth, as by bringing acids into contact with them.
            [archaic] --Bacon.
        (b) to produce a disagreeable or unpleasant sensation; to
            annoy or repel; -- often used of sounds; as, the
            screeching of of the subway train wheels sets my teeth
            on edge.
            [1913 Webster +PJC]

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