(svn r21975) -Add: console command to reset the engine pool. It removes the traces of engines which are no longer associated to a NewGRF, and can be used to e.g. 'fix' scenarios which were screwed up by the author. You can only use it when there are no vehicles in the game though.

src/settings.cpp

@@ -36,7 +36,6 @@
 #include "train.h"
 #include "news_func.h"
 #include "window_func.h"
-#include "vehicle_func.h"
 #include "sound_func.h"
 #include "company_func.h"
 #include "rev.h"
@@ -58,7 +57,6 @@
 #include "ini_type.h"
 #include "ai/ai_config.hpp"
 #include "ai/ai.hpp"
-#include "newgrf.h"
 #include "ship.h"
 #include "smallmap_gui.h"
 #include "roadveh.h"
@@ -1133,18 +1131,11 @@ static bool ChangeDynamicEngines(int32 p1)
 {
 	if (_game_mode == GM_MENU) return true;
 
-	const Vehicle *v;
-	FOR_ALL_VEHICLES(v) {
-		if (IsCompanyBuildableVehicleType(v)) {
-			ShowErrorMessage(STR_CONFIG_SETTING_DYNAMIC_ENGINES_EXISTING_VEHICLES, INVALID_STRING_ID, WL_ERROR);
-			return false;
-		}
+	if (!EngineOverrideManager::ResetToCurrentNewGRFConfig()) {
+		ShowErrorMessage(STR_CONFIG_SETTING_DYNAMIC_ENGINES_EXISTING_VEHICLES, INVALID_STRING_ID, WL_ERROR);
+		return false;
 	}
 
-	/* Reset the engines, they will get new EngineIDs */
-	_engine_mngr.ResetToDefaultMapping();
-	ReloadNewGRFData();
-
 	return true;
 }