(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/console_cmds.cpp

@@ -35,6 +35,7 @@
 #include "ai/ai_config.hpp"
 #include "newgrf.h"
 #include "console_func.h"
+#include "engine_base.h"
 
 #ifdef ENABLE_NETWORK
 	#include "table/strings.h"
@@ -141,6 +142,26 @@ DEF_CONSOLE_CMD(ConResetEngines)
 	return true;
 }
 
+DEF_CONSOLE_CMD(ConResetEnginePool)
+{
+	if (argc == 0) {
+		IConsoleHelp("Reset NewGRF allocations of engine slots. This will remove invalid engine definitions, and might make default engines available again.");
+		return true;
+	}
+
+	if (_game_mode == GM_MENU) {
+		IConsoleError("This command is only available in game and editor.");
+		return true;
+	}
+
+	if (!EngineOverrideManager::ResetToCurrentNewGRFConfig()) {
+		IConsoleError("This can only be done when there are no vehicles in the game.");
+		return true;
+	}
+
+	return true;
+}
+
 #ifdef _DEBUG
 DEF_CONSOLE_CMD(ConResetTile)
 {
@@ -1781,6 +1802,7 @@ void IConsoleStdLibRegister()
 	IConsoleCmdRegister("getdate",      ConGetDate);
 	IConsoleCmdRegister("quit",         ConExit);
 	IConsoleCmdRegister("resetengines", ConResetEngines, ConHookNoNetwork);
+	IConsoleCmdRegister("reset_enginepool", ConResetEnginePool, ConHookNoNetwork);
 	IConsoleCmdRegister("return",       ConReturn);
 	IConsoleCmdRegister("screenshot",   ConScreenShot);
 	IConsoleCmdRegister("script",       ConScript);