diff --git a/src/console_cmds.cpp b/src/console_cmds.cpp
--- a/src/console_cmds.cpp
+++ b/src/console_cmds.cpp
@@ -923,7 +923,7 @@ DEF_CONSOLE_CMD(ConNewGame)
 	return true;
 }
 
-extern void SwitchMode(int new_mode);
+extern void SwitchToMode(SwitchMode new_mode);
 
 DEF_CONSOLE_CMD(ConRestart)
 {
@@ -933,10 +933,10 @@ DEF_CONSOLE_CMD(ConRestart)
 		return true;
 	}
 
-	/* Don't copy the _newgame pointers to the real pointers, so call SwitchMode directly */
+	/* Don't copy the _newgame pointers to the real pointers, so call SwitchToMode directly */
 	_settings_game.game_creation.map_x = MapLogX();
 	_settings_game.game_creation.map_y = FindFirstBit(MapSizeY());
-	SwitchMode(SM_NEWGAME);
+	SwitchToMode(SM_NEWGAME);
 	return true;
 }
 
diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -39,7 +39,7 @@ enum glwp_modes {
 	GLWP_END
 };
 
-extern void SwitchMode(int new_mode);
+extern void SwitchToMode(SwitchMode new_mode);
 extern void MakeNewgameSettingsLive();
 
 static inline void SetNewLandscapeType(byte landscape)
diff --git a/src/gfx.cpp b/src/gfx.cpp
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -38,6 +38,7 @@ bool _screen_disable_anim = false;   ///
 bool _exit_game;
 bool _networking;         ///< are we in networking mode?
 GameMode _game_mode;
+SwitchMode _switch_mode;  ///< The next mainloop command.
 int8 _pause_game;
 int _pal_first_dirty;
 int _pal_count_dirty;
diff --git a/src/network/network_gui.cpp b/src/network/network_gui.cpp
--- a/src/network/network_gui.cpp
+++ b/src/network/network_gui.cpp
@@ -30,7 +30,7 @@
 
 static void ShowNetworkStartServerWindow();
 static void ShowNetworkLobbyWindow(NetworkGameList *ngl);
-extern void SwitchMode(int new_mode);
+extern void SwitchToMode(SwitchMode new_mode);
 
 static const StringID _connection_types_dropdown[] = {
 	STR_NETWORK_LAN_INTERNET,
@@ -1020,7 +1020,7 @@ struct NetworkStartServerWindow : public
 						strecpy(_file_to_saveload.title, this->map->title, lastof(_file_to_saveload.title));
 
 						delete this;
-						SwitchMode(SM_START_SCENARIO);
+						SwitchToMode(SM_START_SCENARIO);
 					}
 				}
 				break;
@@ -1829,7 +1829,7 @@ struct NetworkJoinStatusWindow : Window 
 	{
 		if (widget == 2) { //Disconnect button
 			NetworkDisconnect();
-			SwitchMode(SM_MENU);
+			SwitchToMode(SM_MENU);
 			ShowNetworkGameWindow();
 		}
 	}
diff --git a/src/openttd.cpp b/src/openttd.cpp
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -867,7 +867,7 @@ bool SafeSaveOrLoad(const char *filename
 	}
 }
 
-void SwitchMode(int new_mode)
+void SwitchToMode(SwitchMode new_mode)
 {
 #ifdef ENABLE_NETWORK
 	/* If we are saving something, the network stays in his current state */
@@ -1002,6 +1002,8 @@ void SwitchMode(int new_mode)
 			/* XXX: set date */
 			MarkWholeScreenDirty();
 			break;
+
+		default: NOT_REACHED();
 	}
 
 	if (_switch_mode_errorstr != INVALID_STRING_ID) {
@@ -1146,7 +1148,7 @@ void GameLoop()
 
 	/* switch game mode? */
 	if (_switch_mode != SM_NONE) {
-		SwitchMode(_switch_mode);
+		SwitchToMode(_switch_mode);
 		_switch_mode = SM_NONE;
 	}
 
diff --git a/src/openttd.h b/src/openttd.h
--- a/src/openttd.h
+++ b/src/openttd.h
@@ -11,18 +11,18 @@ enum GameMode {
 	GM_EDITOR,
 };
 
-enum SwitchModes {
-	SM_NONE            =  0,
-	SM_NEWGAME         =  1,
-	SM_EDITOR          =  2,
-	SM_LOAD            =  3,
-	SM_MENU            =  4,
-	SM_SAVE            =  5,
-	SM_GENRANDLAND     =  6,
-	SM_LOAD_SCENARIO   =  9,
-	SM_START_SCENARIO  = 10,
-	SM_START_HEIGHTMAP = 11,
-	SM_LOAD_HEIGHTMAP  = 12,
+enum SwitchMode {
+	SM_NONE,
+	SM_NEWGAME,
+	SM_EDITOR,
+	SM_LOAD,
+	SM_MENU,
+	SM_SAVE,
+	SM_GENRANDLAND,
+	SM_LOAD_SCENARIO,
+	SM_START_SCENARIO,
+	SM_START_HEIGHTMAP,
+	SM_LOAD_HEIGHTMAP,
 };
 
 /* Display Options */
@@ -36,6 +36,7 @@ enum {
 };
 
 extern GameMode _game_mode;
+extern SwitchMode _switch_mode;
 extern bool _exit_game;
 extern int8 _pause_game;
 
diff --git a/src/variables.h b/src/variables.h
--- a/src/variables.h
+++ b/src/variables.h
@@ -49,9 +49,6 @@ VARDEF bool _rightclick_emulate;
 /* IN/OUT parameters to commands */
 VARDEF bool _generating_world;
 
-/* Used when switching from the intro menu. */
-VARDEF byte _switch_mode;
-
 VARDEF char _savegame_format[8];
 
 VARDEF char *_config_file;
diff --git a/src/video/dedicated_v.cpp b/src/video/dedicated_v.cpp
--- a/src/video/dedicated_v.cpp
+++ b/src/video/dedicated_v.cpp
@@ -126,7 +126,7 @@ static void CloseWindowsConsoleThread()
 static void *_dedicated_video_mem;
 
 extern bool SafeSaveOrLoad(const char *filename, int mode, GameMode newgm, Subdirectory subdir);
-extern void SwitchMode(int new_mode);
+extern void SwitchToMode(SwitchMode new_mode);
 
 static FVideoDriver_Dedicated iFVideoDriver_Dedicated;
 
@@ -261,7 +261,7 @@ void VideoDriver_Dedicated::MainLoop()
 	/* If SwitchMode is SM_LOAD, it means that the user used the '-g' options */
 	if (_switch_mode != SM_LOAD) {
 		StartNewGameWithoutGUI(GENERATE_NEW_SEED);
-		SwitchMode(_switch_mode);
+		SwitchToMode(_switch_mode);
 		_switch_mode = SM_NONE;
 	} else {
 		_switch_mode = SM_NONE;
@@ -273,7 +273,7 @@ void VideoDriver_Dedicated::MainLoop()
 			_networking = false;
 		} else {
 			/* We can load this game, so go ahead */
-			SwitchMode(SM_LOAD);
+			SwitchToMode(SM_LOAD);
 		}
 	}