Gets a list of the Railing elements which are associated to the boundaries of the stairs. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Return Value
The ids of the Railing elements.Remarks
 This does not return railings which are sketched directly to the stairs (and are not associated to boundaries).