Share Email Facebook Twitter LinkedIn GroupTypeId.RailingSystemFamilyTopRail Property Top Rail. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public static ForgeTypeId RailingSystemFamilyTopRail { get; }Property ValueForgeTypeId See AlsoReferenceGroupTypeId ClassAutodesk.Revit.DB Namespace