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Stops laterally support the switch point from flexing laterally under a lateral wheel load and thereby possibly exposing the open end of switch point rail to head-on contact from the next wheel.Ī switch operating device moves switch rails. Switch point railstops act as spacers between the switch point rail and the stock rail. Heel block assemblies are units placed at the heel of the switch that provide a splice with the contiguous closure rail and a location for the switch point rail to pivot at a fixed spread distance from the stock rail. These exist to ensure that the wheels follow the appropriate flangeway through the frog and that the train does not derail. Guard rail ( check rail) is a short piece of rail placed alongside the main (stock) rail opposite the frog. The stock rails are otherwise ordinary rails that are machined, drilled, and bent as required to suit the design of the turnout switch and the individual switch point rails.įrog is a component placed where one rail crosses another, refers to the crossing point of two rails. The rest of the English-speaking world calls such units by the more obvious term “crossings.”Ĭlosure rails are the straight or curved rails that are positioned in between the heel of switch and the toe of frog. Stock rails are the running rails immediately alongside of the switch rails against which the switch rails lay when in the closed position. They are tapered on most switches, but on stub switches they have square ends. In ordinary conversation, it is common to use the word “switch” when referring to a “turnout,” which is technically incorrect. Points ( switch rails or point blades) are the movable rails which guide the wheels towards either the straight or the diverging track. Such crossings can be designed as a rigid block or can include movable center points. Track crossings that permit one track to cross another at grade.
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The cross ties to support turnouts and crossovers can also be considered part of special trackwork, especially concrete switch ties, which require far more design and fabrication effort than ordinary timber switch ties. Crossover tracks, double crossovers including the central crossing frogs or diamond area, and single and double slip switches are included in this category. Turnouts and crossovers, including switches, frogs, guard rails, stock rails, and closure rails rail fastening assemblies unique to turnouts and miscellaneous components associated with turnouts, including switch rods and gauge plates.