--- a/src/aircraft_cmd.cpp	Sun Apr 01 11:11:49 2007 +0000
+++ b/src/aircraft_cmd.cpp	Mon Apr 02 11:35:08 2007 +0000
@@ -237,7 +237,7 @@
  */
 int32 CmdBuildAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	if (!IsEngineBuildable(p1, VEH_AIRCRAFT, _current_player)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
+	if (!IsEngineBuildable(p1, VEH_AIRCRAFT, _current_player)) return_cmd_error(STR_AIRCRAFT_NOT_AVAILABLE);
 
 	const AircraftVehicleInfo *avi = AircraftVehInfo(p1);
 	int32 value = EstimateAircraftCost(avi);

--- a/src/lang/english.txt	Sun Apr 01 11:11:49 2007 +0000
+++ b/src/lang/english.txt	Mon Apr 02 11:35:08 2007 +0000
@@ -3012,7 +3012,10 @@
 STR_REPLACE_REMOVE_WAGON_HELP                                   :{BLACK}Make autoreplace keep the length of a train the same by removing wagons (starting at the front), if replacing the engine would make the train longer.
 STR_REPLACE_ENGINE_WAGON_SELECT                                 :{BLACK}Replacing: {ORANGE}{SKIP}{SKIP}{STRING}
 STR_REPLACE_ENGINE_WAGON_SELECT_HELP                            :{BLACK} EXPERIMENTAL FEATURE {}Switch between engine and wagon replacement windows.{}Wagon replacement will only be done if the new wagon can be refitted into carrying the same type of cargo as the old one. This is checked for each wagon when the actual replacement takes place.
-STR_ENGINE_NOT_BUILDABLE                                        :{WHITE}Engine is not buildable
+STR_RAIL_VEHICLE_NOT_AVAILABLE                                  :{WHITE}Vehicle is not available
+STR_ROAD_VEHICLE_NOT_AVAILABLE                                  :{WHITE}Vehicle is not available
+STR_SHIP_NOT_AVAILABLE                                          :{WHITE}Ship is not available
+STR_AIRCRAFT_NOT_AVAILABLE                                      :{WHITE}Aircraft is not available
 
 STR_ENGINES                                                     :Engines
 STR_WAGONS                                                      :Wagons

--- a/src/roadveh_cmd.cpp	Sun Apr 01 11:11:49 2007 +0000
+++ b/src/roadveh_cmd.cpp	Mon Apr 02 11:35:08 2007 +0000
@@ -131,7 +131,7 @@
 	UnitID unit_num;
 	Engine *e;
 
-	if (!IsEngineBuildable(p1, VEH_ROAD, _current_player)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
+	if (!IsEngineBuildable(p1, VEH_ROAD, _current_player)) return_cmd_error(STR_ROAD_VEHICLE_NOT_AVAILABLE);
 
 	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
 

--- a/src/ship_cmd.cpp	Sun Apr 01 11:11:49 2007 +0000
+++ b/src/ship_cmd.cpp	Mon Apr 02 11:35:08 2007 +0000
@@ -844,7 +844,7 @@
 	UnitID unit_num;
 	Engine *e;
 
-	if (!IsEngineBuildable(p1, VEH_SHIP, _current_player)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
+	if (!IsEngineBuildable(p1, VEH_SHIP, _current_player)) return_cmd_error(STR_SHIP_NOT_AVAILABLE);
 
 	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
 

--- a/src/train_cmd.cpp	Sun Apr 01 11:11:49 2007 +0000
+++ b/src/train_cmd.cpp	Mon Apr 02 11:35:08 2007 +0000
@@ -704,7 +704,7 @@
 int32 CmdBuildRailVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	/* Check if the engine-type is valid (for the player) */
-	if (!IsEngineBuildable(p1, VEH_TRAIN, _current_player)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
+	if (!IsEngineBuildable(p1, VEH_TRAIN, _current_player)) return_cmd_error(STR_RAIL_VEHICLE_NOT_AVAILABLE);
 
 	/* Check if the train is actually being built in a depot belonging
 	 * to the player. Doesn't matter if only the cost is queried */