Transcription of Turnout Geometry - Gauge 0 Guild
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Turnout Geometry - Gauge 0 Guild
Issue 1 June 2004 Compiled by M. HollandTURNOUT GEOMETRYDATA SHEETT urnout Geometry1 GeneralThe terms used in Point and Crossing Work areillustrated in Figure 1 and defined in the table below. Note in particular that there are two definitions thatinclude the term Lead . Throughout this work, thedefinition of Lead , symbol LT, is the distance betweenthe Switch Heel and the Intersection of the GaugeLines. The other definition, symbol L, is the distancefrom the Switch Toe to the Noseof the crossing and isStock rail length LBSwitch radiusRSSwitch railStock railUsually5'4"- 5'5"but see textPlanedlength LPHeel length LHFull lead LHHeelI NGaugeintersectionTToeNoseLead LTNosedistance LNTurnout radiusRTHeel divergencehdHeel clearancehdRail width hrCheck railSplice railCrossinganglePoint railWing railsSwitchangle1 in a1 in Figure 1 Geometry of a turnoutreferred to as the Full Lead . The omission of the word Full can often cause confusion. The Switch Heel isthe point about which the switch blade theoreticallypivots; this may be a true pivot or merely a point at whichthe switch blade becomes free to bend.
D2.2.1.1 Issue 1 June 2004 Compiled by M. Holland TURNOUT GEOMETRY 3 2.3 Curved switch This was used by the GWR instead of the semi-curved switch.
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