Allow converting track by individual track pieces instead of whole tiles

Ctrl-click on convert button

See: #509

src/command.cpp

@@ -53,6 +53,7 @@ CommandProc CmdBuildBridge;
 CommandProcEx CmdBuildRailStation;
 CommandProc CmdRemoveFromRailStation;
 CommandProc CmdConvertRail;
+CommandProc CmdConvertRailTrack;
 
 CommandProc CmdBuildSingleSignal;
 CommandProc CmdRemoveSingleSignal;
@@ -334,6 +335,7 @@ static const Command _command_proc_table[] = {
 	DEF_CMD(CmdBuildTunnel,                 CMD_DEITY | CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_TUNNEL
 	DEF_CMD(CmdRemoveFromRailStation,                          0, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_REMOVE_FROM_RAIL_STATION
 	DEF_CMD(CmdConvertRail,                                    0, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_CONVERT_RAIL
+	DEF_CMD(CmdConvertRailTrack,                               0, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_CONVERT_RAIL_TRACK
 	DEF_CMD(CmdBuildRailWaypoint,                              0, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_RAIL_WAYPOINT
 	DEF_CMD(CmdBuildRoadWaypoint,                              0, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_ROAD_WAYPOINT
 	DEF_CMD(CmdRenameWaypoint,                                 0, CMDT_OTHER_MANAGEMENT      ), // CMD_RENAME_WAYPOINT

src/command_type.h

@@ -296,6 +296,7 @@ enum Commands {
 
 	CMD_REMOVE_FROM_RAIL_STATION,     ///< remove a (rectangle of) tiles from a rail station
 	CMD_CONVERT_RAIL,                 ///< convert a rail type
+	CMD_CONVERT_RAIL_TRACK,           ///< convert a rail type (track)
 
 	CMD_BUILD_RAIL_WAYPOINT,          ///< build a waypoint
 	CMD_BUILD_ROAD_WAYPOINT,          ///< build a road waypoint

src/lang/extra/english.txt

@@ -2068,3 +2068,5 @@ STR_STATION_VIEW_RENAME_TOOLTIP_EXTRA                           :{BLACK}{STRING}
 STR_ERROR_CAN_T_EXCHANGE_STATION_NAMES                          :{WHITE}Can't exchange station names...
 STR_ERROR_STATIONS_NOT_IN_SAME_TOWN                             :{WHITE}... stations are not in the same town
 STR_ERROR_STATION_ATTACHED_TO_INDUSTRY                          :{WHITE}... station is attached to an industry
+
+STR_RAIL_TOOLBAR_TOOLTIP_CONVERT_RAIL_EXTRA                     :{STRING}{}{BLACK}Ctrl+Click to convert track pieces instead of whole tiles.

src/rail_cmd.cpp

@@ -2323,6 +2323,36 @@ static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
 	return nullptr;
 }
 
+struct UpdateTrainPowerProcData {
+	TrainList *train_list;
+	TrackBits track_bits;
+};
+
+/** Update power of train under which is the railtype being converted */
+static Vehicle *UpdateTrainPowerProcAcrossTunnelBridge(Vehicle *v, void *data)
+{
+	UpdateTrainPowerProcData *utpp_data = static_cast<UpdateTrainPowerProcData*>(data);
+
+	TrackBits vehicle_track = Train::From(v)->track;
+	if (!(vehicle_track & TRACK_BIT_WORMHOLE) && !(utpp_data->track_bits & vehicle_track)) return nullptr;
+
+	include(*(utpp_data->train_list), Train::From(v)->First());
+
+	return nullptr;
+}
+
+/** Update power of train under which is the railtype being converted */
+static Vehicle *UpdateTrainPowerProcOnTrackBits(Vehicle *v, void *data)
+{
+	UpdateTrainPowerProcData *utpp_data = static_cast<UpdateTrainPowerProcData*>(data);
+
+	if (!(utpp_data->track_bits & Train::From(v)->track)) return nullptr;
+
+	include(*(utpp_data->train_list), Train::From(v)->First());
+
+	return nullptr;
+}
+
 struct EnsureNoIncompatibleRailtypeTrainOnGroundData {
 	int z;
 	RailType type;
@@ -2659,6 +2689,320 @@ CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint3
 	return found_convertible_track ? cost : error;
 }
 
+/**
+ * Convert rail on a stretch of track.
+ * @param tile start tile of drag
+ * @param flags operation to perform
+ * @param p1 end tile of drag
+ * @param p2 various bitstuffed elements
+ * - p2 = (bit 0-5) - railroad type normal/maglev (0 = normal, 1 = mono, 2 = maglev)
+ * - p2 = (bit 6-8) - track-orientation, valid values: 0-5 (Track enum)
+ * @param text unused
+ * @return the cost of this operation or an error
+ */
+CommandCost CmdConvertRailTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
+{
+	const RailType totype = Extract<RailType, 0, 6>(p2);
+	const TileIndex end_tile = p1;
+
+	if (!ValParamRailtype(totype)) return CMD_ERROR;
+	if (end_tile >= MapSize()) return CMD_ERROR;
+
+	const Track start_track = Extract<Track, 6, 3>(p2);
+	Trackdir trackdir = TrackToTrackdir(start_track);
+
+	CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
+	if (ret.Failed()) return ret;
+
+	TrainList affected_trains;
+
+	CommandCost cost(EXPENSES_CONSTRUCTION);
+	CommandCost error = CommandCost(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK); // by default, there is no track to convert.
+	bool found_convertible_track = false; // whether we actually did convert some track (see bug #7633)
+
+	std::vector<TileIndex> exclude_tiles;
+
+	auto advance_tile = [&]() -> bool {
+		if (tile == end_tile) return false;
+
+		tile += ToTileIndexDiff(_trackdelta[trackdir]);
+
+		/* toggle railbit for the non-diagonal tracks */
+		if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
+		return true;
+	};
+	do {
+		if (std::find(exclude_tiles.begin(), exclude_tiles.end(), tile) != exclude_tiles.end()) continue;
+
+		const Track track = TrackdirToTrack(trackdir);
+		const TileType tt = GetTileType(tile);
+
+		TrackBits all_track_bits = TRACK_BIT_NONE;
+
+		/* Check if our track piece matches any track on tile */
+		switch (tt) {
+			case MP_RAILWAY:
+				if (IsPlainRail(tile)) {
+					if (!HasTrack(tile, track)) continue;
+					all_track_bits = GetTrackBits(tile);
+				} else if (IsRailDepot(tile)) {
+					if (GetRailDepotTrack(tile) != track) continue;
+					all_track_bits = TrackToTrackBits(track);
+				} else {
+					continue;
+				}
+				break;
+			case MP_STATION:
+				if (!HasStationRail(tile) || GetRailStationTrack(tile) != track) continue;
+				all_track_bits = GetRailStationTrackBits(tile);
+				break;
+			case MP_ROAD:
+				if (!IsLevelCrossing(tile) || GetCrossingRailTrack(tile) != track) continue;
+				if (RailNoLevelCrossings(totype)) {
+					error.MakeError(STR_ERROR_CROSSING_DISALLOWED_RAIL);
+					continue;
+				}
+				all_track_bits = GetCrossingRailBits(tile);
+				break;
+			case MP_TUNNELBRIDGE:
+				if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL || !HasBit(GetTunnelBridgeTrackBits(tile), track)) continue;
+				all_track_bits = GetTunnelBridgeTrackBits(tile);
+				break;
+			default: continue;
+		}
+
+		/* Original railtype we are converting from */
+		const RailType type = GetRailTypeByTrack(tile, track);
+
+		/* Converting to the same type or converting 'hidden' elrail -> rail */
+		if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
+
+		/* Trying to convert other's rail */
+		CommandCost ret = CheckTileOwnership(tile);
+		if (ret.Failed()) {
+			error = ret;
+			continue;
+		}
+
+		/* Track bits on the tile to convert */
+		const TrackBits track_bits = (all_track_bits == TRACK_BIT_HORZ || all_track_bits == TRACK_BIT_VERT) ? TrackToTrackBits(track) : all_track_bits;
+
+		std::vector<Train *> vehicles_affected;
+
+		auto find_train_reservations = [&vehicles_affected, &totype, &flags](TileIndex tile, TrackBits reserved) -> CommandCost {
+			if (!(flags & DC_EXEC) && _settings_game.vehicle.train_braking_model != TBM_REALISTIC) {
+				/* Nothing to do */
+				return CommandCost();
+			}
+			Track track;
+			while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
+				Train *v = GetTrainForReservation(tile, track);
+				bool check_train = false;
+				if (v != nullptr && !HasPowerOnRail(v->railtype, totype)) {
+					check_train = true;
+				} else if (v != nullptr && _settings_game.vehicle.train_braking_model == TBM_REALISTIC) {
+					RailType original = GetRailTypeByTrack(tile, track);
+					if ((uint)(GetRailTypeInfo(original)->max_speed - 1) > (uint)(GetRailTypeInfo(totype)->max_speed - 1)) {
+						check_train = true;
+					}
+				}
+				if (check_train) {
+					CommandCost ret = CheckTrainReservationPreventsTrackModification(v);
+					if (ret.Failed()) return ret;
+
+					/* No power on new rail type, reroute. */
+					if (flags & DC_EXEC) {
+						FreeTrainTrackReservation(v);
+						vehicles_affected.push_back(v);
+					}
+				}
+			}
+			return CommandCost();
+		};
+
+		auto yapf_notify_track_change = [](TileIndex tile, TrackBits tracks) {
+			while (tracks != TRACK_BIT_NONE) {
+				YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
+			}
+		};
+
+		/* Vehicle on the tile when not converting Rail <-> ElRail
+		 * Tunnels and bridges have special check later */
+		if (tt != MP_TUNNELBRIDGE) {
+			if (!IsCompatibleRail(type, totype)) {
+				CommandCost ret = IsPlainRailTile(tile) ? EnsureNoIncompatibleRailtypeTrainOnTrackBits(tile, track_bits, totype) : EnsureNoIncompatibleRailtypeTrainOnGround(tile, totype);
+				if (ret.Failed()) {
+					error = ret;
+					continue;
+				}
+			}
+			CommandCost ret = find_train_reservations(tile, GetReservedTrackbits(tile) & track_bits);
+			if (ret.Failed()) return ret;
+			if (flags & DC_EXEC) { // we can safely convert, too
+				/* Update the company infrastructure counters. */
+				if (!IsRailStationTile(tile) || !IsStationTileBlocked(tile)) {
+					Company *c = Company::Get(GetTileOwner(tile));
+					uint num_pieces = IsLevelCrossingTile(tile) ? LEVELCROSSING_TRACKBIT_FACTOR : 1;
+					if (IsPlainRailTile(tile)) {
+						num_pieces = CountBits(track_bits);
+						if (TracksOverlap(track_bits)) num_pieces *= num_pieces;
+					}
+					c->infrastructure.rail[type] -= num_pieces;
+					c->infrastructure.rail[totype] += num_pieces;
+					DirtyCompanyInfrastructureWindows(c->index);
+				}
+
+				if (track_bits != all_track_bits) {
+					/* only partially converting the tile */
+					if (track_bits & TRACK_BIT_RT_1) {
+						SetRailType(tile, totype);
+					} else {
+						SetSecondaryRailType(tile, totype);
+					}
+				} else {
+					SetRailType(tile, totype);
+					if (IsPlainRailTile(tile)) SetSecondaryRailType(tile, totype);
+				}
+
+				MarkTileDirtyByTile(tile);
+				/* update power of train on this tile */
+				UpdateTrainPowerProcData data;
+				data.train_list = &affected_trains;
+				data.track_bits = track_bits;
+				FindVehicleOnPos(tile, VEH_TRAIN, &data, &UpdateTrainPowerProcOnTrackBits);
+			}
+		}
+
+		switch (tt) {
+			case MP_RAILWAY:
+				switch (GetRailTileType(tile)) {
+					case RAIL_TILE_DEPOT:
+						if (flags & DC_EXEC) {
+							/* notify YAPF about the track layout change */
+							YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
+
+							/* Update build vehicle window related to this depot */
+							InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
+							InvalidateWindowData(WC_BUILD_VEHICLE, tile);
+						}
+						found_convertible_track = true;
+						cost.AddCost(RailConvertCost(type, totype));
+						break;
+
+					default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
+						if (flags & DC_EXEC) {
+							/* notify YAPF about the track layout change */
+							yapf_notify_track_change(tile, track_bits);
+						}
+						found_convertible_track = true;
+						cost.AddCost(RailConvertCost(type, totype) * CountBits(track_bits));
+						break;
+				}
+				break;
+
+			case MP_TUNNELBRIDGE: {
+				TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
+
+				const bool across = (GetAcrossTunnelBridgeTrackBits(tile) & track_bits) != TRACK_BIT_NONE;
+				if (across) exclude_tiles.push_back(endtile);
+
+				/* When not converting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
+				if (!IsCompatibleRail(type, totype)) {
+					CommandCost ret;
+					if (across) {
+						ret = TunnelBridgeIsFree(tile, endtile, nullptr, TBIFM_PRIMARY_ONLY);
+					} else {
+						ret = EnsureNoIncompatibleRailtypeTrainOnTrackBits(tile, track_bits, totype);
+					}
+					if (ret.Failed()) {
+						error = ret;
+						continue;
+					}
+				}
+
+				found_convertible_track = true;
+
+				if (across) {
+					uint num_primary_pieces = GetTunnelBridgeLength(tile, endtile) + CountBits(GetPrimaryTunnelBridgeTrackBits(tile)) + CountBits(GetPrimaryTunnelBridgeTrackBits(endtile));
+					cost.AddCost(num_primary_pieces * RailConvertCost(type, totype));
+				} else {
+					cost.AddCost(RailConvertCost(type, totype));
+				}
+
+				CommandCost ret = find_train_reservations(tile, GetTunnelBridgeReservationTrackBits(tile) & track_bits);
+				if (ret.Failed()) return ret;
+				if (across) {
+					ret = find_train_reservations(endtile, GetTunnelBridgeReservationTrackBits(endtile) & GetPrimaryTunnelBridgeTrackBits(endtile));
+					if (ret.Failed()) return ret;
+				}
+				if (across && (uint)(GetRailTypeInfo(type)->max_speed - 1) > (uint)(GetRailTypeInfo(totype)->max_speed - 1)) {
+					ret = CheckTrainInTunnelBridgePreventsTrackModification(tile, endtile);
+					if (ret.Failed()) return ret;
+				}
+
+				if (flags & DC_EXEC) {
+					SubtractRailTunnelBridgeInfrastructure(tile, endtile);
+
+					if (across) {
+						SetRailType(tile, totype);
+						SetRailType(endtile, totype);
+					} else {
+						SetSecondaryRailType(tile, totype);
+					}
+
+					UpdateTrainPowerProcData data;
+					data.train_list = &affected_trains;
+					data.track_bits = track_bits;
+					if (across) {
+						FindVehicleOnPos(tile, VEH_TRAIN, &data, &UpdateTrainPowerProcAcrossTunnelBridge);
+						data.track_bits = GetPrimaryTunnelBridgeTrackBits(endtile);
+						FindVehicleOnPos(endtile, VEH_TRAIN, &data, &UpdateTrainPowerProcAcrossTunnelBridge);
+					} else {
+						FindVehicleOnPos(tile, VEH_TRAIN, &data, &UpdateTrainPowerProcOnTrackBits);
+					}
+
+					/* notify YAPF about the track layout change */
+					yapf_notify_track_change(tile, track_bits);
+					if (across) yapf_notify_track_change(endtile, GetPrimaryTunnelBridgeTrackBits(endtile));
+
+					if (IsBridge(tile)) {
+						MarkBridgeDirty(tile);
+					} else {
+						MarkTileDirtyByTile(tile);
+						MarkTileDirtyByTile(endtile);
+					}
+
+					AddRailTunnelBridgeInfrastructure(tile, endtile);
+					DirtyCompanyInfrastructureWindows(Company::Get(GetTileOwner(tile))->index);
+				}
+				break;
+			}
+
+			default: // MP_STATION, MP_ROAD
+				if (flags & DC_EXEC) {
+					YapfNotifyTrackLayoutChange(tile, track);
+				}
+
+				found_convertible_track = true;
+				cost.AddCost(RailConvertCost(type, totype));
+				break;
+		}
+
+		for (uint i = 0; i < vehicles_affected.size(); ++i) {
+			TryPathReserve(vehicles_affected[i], true);
+		}
+	} while (advance_tile());
+
+	if (flags & DC_EXEC) {
+		/* Railtype changed, update trains as when entering different track */
+		for (Train *v : affected_trains) {
+			v->ConsistChanged(CCF_TRACK);
+		}
+	}
+
+	return found_convertible_track ? cost : error;
+}
+
 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
 {
 	if (_current_company != OWNER_WATER) {

src/rail_gui.cpp

@@ -726,10 +726,12 @@ struct BuildRailToolbarWindow : Window {
 				BuildRailClick_Remove(this);
 				break;
 
-			case WID_RAT_CONVERT_RAIL:
-				HandlePlacePushButton(this, WID_RAT_CONVERT_RAIL, GetRailTypeInfo(_cur_railtype)->cursor.convert, HT_RECT | HT_DIAGONAL);
+			case WID_RAT_CONVERT_RAIL: {
+				bool active = HandlePlacePushButton(this, WID_RAT_CONVERT_RAIL, GetRailTypeInfo(_cur_railtype)->cursor.convert, _ctrl_pressed ? HT_RAIL : HT_RECT | HT_DIAGONAL);
+				if (active && _ctrl_pressed) _thd.square_palette = SPR_ZONING_INNER_HIGHLIGHT_GREEN;
 				this->last_user_action = widget;
 				break;
+			}
 
 			default: NOT_REACHED();
 		}
@@ -737,6 +739,14 @@ struct BuildRailToolbarWindow : Window {
 		if (_ctrl_pressed) RailToolbar_CtrlChanged(this);
 	}
 
+	virtual void OnHover(Point pt, int widget) override
+	{
+		if (widget == WID_RAT_CONVERT_RAIL) {
+			uint64 args[] = { STR_RAIL_TOOLBAR_TOOLTIP_CONVERT_RAIL };
+			GuiShowTooltips(this, STR_RAIL_TOOLBAR_TOOLTIP_CONVERT_RAIL_EXTRA, lengthof(args), args, TCC_HOVER);
+		}
+	}
+
 	EventState OnHotkey(int hotkey) override
 	{
 		MarkTileDirtyByTile(TileVirtXY(_thd.pos.x, _thd.pos.y)); // redraw tile selection
@@ -806,7 +816,11 @@ struct BuildRailToolbarWindow : Window {
 				break;
 
 			case WID_RAT_CONVERT_RAIL:
-				VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_CONVERT_RAIL);
+				if (_thd.place_mode & HT_RAIL) {
+					VpStartPlaceSizing(tile, VPM_RAILDIRS, DDSP_CONVERT_RAIL_TRACK);
+				} else {
+					VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_CONVERT_RAIL);
+				}
 				break;
 
 			default: NOT_REACHED();
@@ -847,6 +861,14 @@ struct BuildRailToolbarWindow : Window {
 					DoCommandP(end_tile, start_tile, _cur_railtype | (_ctrl_pressed ? (1 << 6) : 0), CMD_CONVERT_RAIL | CMD_MSG(STR_ERROR_CAN_T_CONVERT_RAIL), CcPlaySound_CONSTRUCTION_RAIL);
 					break;
 
+				case DDSP_CONVERT_RAIL_TRACK: {
+					Track track = (Track)(_thd.drawstyle & HT_DIR_MASK); // 0..5
+					TileIndex start_tile = TileVirtXY(_thd.selstart.x, _thd.selstart.y);
+					TileIndex end_tile = TileVirtXY(_thd.selend.x, _thd.selend.y);
+					DoCommandP((_thd.drawstyle & HT_RAIL) ? end_tile : start_tile, end_tile, _cur_railtype | (track << 6), CMD_CONVERT_RAIL_TRACK | CMD_MSG(STR_ERROR_CAN_T_CONVERT_RAIL), CcPlaySound_CONSTRUCTION_RAIL);
+					break;
+				}
+
 				case DDSP_REMOVE_STATION:
 				case DDSP_BUILD_STATION:
 					if (this->IsWidgetLowered(WID_RAT_BUILD_STATION)) {
@@ -986,7 +1008,7 @@ static const NWidgetPart _nested_build_rail_widgets[] = {
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_REMOVE),
 						SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_REMOVE, STR_RAIL_TOOLBAR_TOOLTIP_TOGGLE_BUILD_REMOVE_FOR),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_CONVERT_RAIL),
-						SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_CONVERT_RAIL, STR_RAIL_TOOLBAR_TOOLTIP_CONVERT_RAIL),
+						SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_CONVERT_RAIL, 0),
 	EndContainer(),
 };
 

src/vehicle.cpp

@@ -632,6 +632,7 @@ static Vehicle *GetVehicleTunnelBridgeProc(Vehicle *v, void *data)
 		TrackBits vehicle_track = Train::From(v)->track;
 		if (!(vehicle_track & TRACK_BIT_WORMHOLE)) {
 			if (info->mode == TBIFM_ACROSS_ONLY && !(GetAcrossBridgePossibleTrackBits(info->t) & vehicle_track)) return nullptr;
+			if (info->mode == TBIFM_PRIMARY_ONLY && !(GetPrimaryTunnelBridgeTrackBits(info->t) & vehicle_track)) return nullptr;
 		}
 	}
 
@@ -643,7 +644,7 @@ static Vehicle *GetVehicleTunnelBridgeProc(Vehicle *v, void *data)
  * @param tile first end
  * @param endtile second end
  * @param ignore Ignore this vehicle when searching
- * @param mode Whether to only find vehicles which are passing across the bridge/tunnel or on connecting bridge head track pieces
+ * @param mode Whether to only find vehicles which are passing across the bridge/tunnel or on connecting bridge head track pieces, or only on primary track type pieces
  * @return Succeeded command (if tunnel/bridge is free) or failed command (if a vehicle is using the tunnel/bridge).
  */
 CommandCost TunnelBridgeIsFree(TileIndex tile, TileIndex endtile, const Vehicle *ignore, TunnelBridgeIsFreeMode mode)

src/vehicle_func.h

@@ -136,6 +136,7 @@ void ShowNewGrfVehicleError(EngineID engine, StringID part1, StringID part2, GRF
 enum TunnelBridgeIsFreeMode {
 	TBIFM_ALL,
 	TBIFM_ACROSS_ONLY,
+	TBIFM_PRIMARY_ONLY,
 };
 CommandCost TunnelBridgeIsFree(TileIndex tile, TileIndex endtile, const Vehicle *ignore = nullptr, TunnelBridgeIsFreeMode mode = TBIFM_ALL);
 Train *GetTrainClosestToTunnelBridgeEnd(TileIndex tile, TileIndex other_tile);

src/viewport_type.h

@@ -186,6 +186,7 @@ enum ViewportDragDropSelectionProcess {
 	DDSP_BUILD_STATION,        ///< Station placement
 	DDSP_REMOVE_STATION,       ///< Station removal
 	DDSP_CONVERT_RAIL,         ///< Rail conversion
+	DDSP_CONVERT_RAIL_TRACK,   ///< Rail conversion (track)
 
 	/* Road specific actions */
 	DDSP_PLACE_ROAD_X_DIR,     ///< Road placement (X axis)