Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

### - u -

- undelivered_supply : Node
- UnfocusFocusedWidget() : Window
- UnFork() : Path
- Unfreeze() : LinkStat
- Uninitialize() : AI
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- Unreserve() : VehicleCargoList
- UnreserveSingleTrack() : CYapfReserveTrack< Types >
- unsatisfied_demand : Edge
- Unselect() : ClientNetworkContentSocketHandler
- UnselectAll() : ClientNetworkContentSocketHandler
- UNSELECTED : ContentInfo
- UnselectVehicle() : VehicleGroupWindow
- unshaded_size : Window
- UnshareOrders() : AIOrder
- unwanted : Town
- Update() : Backup< T > , CargoDataEntry
- update_frequency : ServerNetworkAdminSocketHandler
- UpdateCache() : Ship
- UpdateDeltaXY() : Train , Vehicle , DisasterVehicle , Aircraft , EffectVehicle , RoadVehicle , Ship
- UpdateFlowStats() : GoodsEntry
- UpdateFlowStatsTransfer() : GoodsEntry
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateLabel() : Town
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateRealOrderIndex() : Vehicle
- UpdateSelectionStates() : TimetableWindow
- UpdateSpeed() : RoadVehicle , Train
- UpdateStatistics() : BaseGraphWindow
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : BuildRailStationWindow , StatusBarWindow , BuildBridgeWindow , MusicTrackSelectionWindow , TimeWindow , QueryWindow , VehicleListWindow , ErrmsgWindow , VehicleDetailsWindow , BuildVehicleWindow , CheatWindow , IndustryCargoesWindow , IndustryDirectoryWindow , IndustryViewWindow , CompanyFinancesWindow , VehicleGroupWindow , SelectCompanyLiveryWindow , SelectCompanyManagerFaceWindow , CompanyWindow , BaseGraphWindow , GenerateProgressWindow , CreateScenarioWindow , BuyCompanyWindow , RefitWindow , SetDateWindow , SetMinutesWindow , DeparturesWindow< Twaypoint > , DepotWindow , TimetableWindow , EnginePreviewWindow , ScenarioEditorToolbarWindow , BuildRailWaypointWindow , PaymentRatesGraphWindow , CompanyLeagueWindow , PerformanceRatingDetailWindow , ReplaceVehicleWindow , BuildAirportWindow , AIConfigWindow , SubsidyListWindow , AIListWindow , CompanyStationsWindow , VehicleViewWindow , StationViewWindow , BuildIndustryWindow , OrdersWindow , MessageOptionsWindow , SelectStationWindow< T > , TownAuthorityWindow , NetworkJoinStatusWindow , NetworkClientListPopupWindow , NetworkLobbyWindow , GameSettingsWindow , TooltipsWindow , CustomCurrencyWindow , SelectGameWindow , LandInfoWindow , AboutWindow , GameDifficultyWindow , NetworkClientListWindow , NewGRFParametersWindow , Window , MusicWindow , ProgramWindow , BuildObjectWindow , NewsWindow , MessageHistoryWindow , NewGRFInspectWindow , BuildTreesWindow , AISettingsWindow , TownViewWindow , GameOptionsWindow , SpriteAlignerWindow , TownDirectoryWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : NetworkHTTPContentConnecter , ContentInfo
- Usage() : LinkStat
- usage : LinkStat
- use_as_random : AIInfo
- use_password : NetworkGameInfo , NetworkCompanyInfo
- UseAsRandomAI() : AIInfo
- used : AILog::LogData
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_32bppAnim , Blitter , Blitter_Null , Blitter_32bppBase , Blitter_8bppBase
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec