Pset_RailwaySignalOccurrence Properties common to the definition of occurrences of _IfcSignal_ applied in railways. IfcSignal IfcSignal ApproachSpeed The design speed of trains approaching the signal if different from the line speed. HandSignallingProhibited Indicates if hand signalling is prohibited in case of any failure. LimitedClearances Special conditions for placing the signal post telephone: tunnels, bridges, viaducts. NumberOfLampsNotUsed Number of lamps which are not needed and blanked out (sealed). RequiresOLEMesh Indicates whether an OLE mesh is required to protect the signal or maintainer. RequiresSafetyHandrail Indicates whether a safety handrail is required. SignalPostTelephoneID The identifier of the signal post telephone attached to the signal. SignalPostTelephoneType Indicates the type of the signal post telephone, e.g. locked, direct line, dial phone. SpecialPositionArrangement Type of special position at which the signal is placed. HinderingObstaclesDescription Description of obstacles that hinder the visibility for the staff in the station. SignalWalkwayLength Indicates the length of the walkway from signal to signal post telephone. RequiresBannerSignal Indicates whether a banner repeater signal is required. DistanceToStopMark Distance from the signal to the nearest stop mark at a platform.