diff --git a/src/rail_gui.cpp b/src/rail_gui.cpp
--- a/src/rail_gui.cpp
+++ b/src/rail_gui.cpp
@@ -415,9 +415,9 @@ struct BuildRailToolbarWindow : Window {
 	RailType railtype;    ///< Rail type to build.
 	int last_user_action; ///< Last started user action.
 
-	BuildRailToolbarWindow(const WindowDesc *desc, RailType railtype) : Window()
+	BuildRailToolbarWindow(WindowDesc *desc, RailType railtype) : Window(desc)
 	{
-		this->InitNested(desc, TRANSPORT_RAIL);
+		this->InitNested(TRANSPORT_RAIL);
 		this->SetupRailToolbar(railtype);
 		this->DisableWidget(WID_RAT_REMOVE);
 		this->last_user_action = WIDGET_LIST_END;
@@ -819,7 +819,7 @@ static const NWidgetPart _nested_build_r
 	EndContainer(),
 };
 
-static const WindowDesc _build_rail_desc(
+static WindowDesc _build_rail_desc(
 	WDP_ALIGN_TOOLBAR, 0, 0,
 	WC_BUILD_TOOLBAR, WC_NONE,
 	WDF_CONSTRUCTION,
@@ -912,20 +912,20 @@ private:
 	}
 
 public:
-	BuildRailStationWindow(const WindowDesc *desc, Window *parent, bool newstation) : PickerWindowBase(parent)
+	BuildRailStationWindow(WindowDesc *desc, Window *parent, bool newstation) : PickerWindowBase(desc, parent)
 	{
 		this->coverage_height = 2 * FONT_HEIGHT_NORMAL + 3 * WD_PAR_VSEP_NORMAL;
 		this->vscroll = NULL;
 		_railstation.newstations = newstation;
 
-		this->CreateNestedTree(desc);
+		this->CreateNestedTree();
 		NWidgetStacked *newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_ADDITIONS);
 		newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
 		newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_MATRIX);
 		newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
 		newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_RESIZE);
 		newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
-		this->FinishInitNested(desc, TRANSPORT_RAIL);
+		this->FinishInitNested(TRANSPORT_RAIL);
 
 		this->LowerWidget(_railstation.orientation + WID_BRAS_PLATFORM_DIR_X);
 		if (_settings_client.gui.station_dragdrop) {
@@ -1427,7 +1427,7 @@ static const NWidgetPart _nested_station
 };
 
 /** High level window description of the station-build window (default & newGRF) */
-static const WindowDesc _station_builder_desc(
+static WindowDesc _station_builder_desc(
 	WDP_AUTO, 350, 0,
 	WC_BUILD_STATION, WC_BUILD_TOOLBAR,
 	WDF_CONSTRUCTION,
@@ -1475,9 +1475,9 @@ private:
 	}
 
 public:
-	BuildSignalWindow(const WindowDesc *desc, Window *parent) : PickerWindowBase(parent)
+	BuildSignalWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
 	{
-		this->InitNested(desc, TRANSPORT_RAIL);
+		this->InitNested(TRANSPORT_RAIL);
 		this->OnInvalidateData();
 	}
 
@@ -1614,7 +1614,7 @@ static const NWidgetPart _nested_signal_
 };
 
 /** Signal selection window description */
-static const WindowDesc _signal_builder_desc(
+static WindowDesc _signal_builder_desc(
 	WDP_AUTO, 0, 0,
 	WC_BUILD_SIGNAL, WC_BUILD_TOOLBAR,
 	WDF_CONSTRUCTION,
@@ -1630,9 +1630,9 @@ static void ShowSignalBuilder(Window *pa
 }
 
 struct BuildRailDepotWindow : public PickerWindowBase {
-	BuildRailDepotWindow(const WindowDesc *desc, Window *parent) : PickerWindowBase(parent)
+	BuildRailDepotWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
 	{
-		this->InitNested(desc, TRANSPORT_RAIL);
+		this->InitNested(TRANSPORT_RAIL);
 		this->LowerWidget(_build_depot_direction + WID_BRAD_DEPOT_NE);
 	}
 
@@ -1691,7 +1691,7 @@ static const NWidgetPart _nested_build_d
 	EndContainer(),
 };
 
-static const WindowDesc _build_depot_desc(
+static WindowDesc _build_depot_desc(
 	WDP_AUTO, 0, 0,
 	WC_BUILD_DEPOT, WC_BUILD_TOOLBAR,
 	WDF_CONSTRUCTION,
@@ -1704,14 +1704,14 @@ static void ShowBuildTrainDepotPicker(Wi
 }
 
 struct BuildRailWaypointWindow : PickerWindowBase {
-	BuildRailWaypointWindow(const WindowDesc *desc, Window *parent) : PickerWindowBase(parent)
+	BuildRailWaypointWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
 	{
-		this->CreateNestedTree(desc);
+		this->CreateNestedTree();
 
 		NWidgetMatrix *matrix = this->GetWidget<NWidgetMatrix>(WID_BRW_WAYPOINT_MATRIX);
 		matrix->SetScrollbar(this->GetScrollbar(WID_BRW_SCROLL));
 
-		this->FinishInitNested(desc, TRANSPORT_RAIL);
+		this->FinishInitNested(TRANSPORT_RAIL);
 
 		matrix->SetCount(_waypoint_count);
 		matrix->SetClicked(_cur_waypoint_type);
@@ -1784,7 +1784,7 @@ static const NWidgetPart _nested_build_w
 	EndContainer(),
 };
 
-static const WindowDesc _build_waypoint_desc(
+static WindowDesc _build_waypoint_desc(
 	WDP_AUTO, 0, 0,
 	WC_BUILD_WAYPOINT, WC_BUILD_TOOLBAR,
 	WDF_CONSTRUCTION,