Clear state when setting changed

src/settings.cpp

@@ -1541,6 +1541,15 @@ static bool PublicRoadsSettingChange(int32 p1) {
 	return true;
 }
 
+static bool TrainSpeedAdaptionChanged(int32 p1) {
+	extern void ClearAllSignalSpeedRestrictions();
+	ClearAllSignalSpeedRestrictions();
+	for (Train *t : Train::Iterate()) {
+		t->signal_speed_restriction = 0;
+	}
+	return true;
+}
+
 /** Checks if any settings are set to incorrect values, and sets them to correct values in that case. */
 static void ValidateSettings()
 {

src/table/settings.ini

@@ -64,6 +64,7 @@ static bool ClimateThresholdModeChanged(int32 p1);
 static bool VelocityUnitsChanged(int32 p1);
 static bool ChangeTrackTypeSortMode(int32 p1);
 static bool PublicRoadsSettingChange(int32 p1);
+static bool TrainSpeedAdaptionChanged(int32 p1);
 
 static bool UpdateClientName(int32 p1);
 static bool UpdateServerPassword(int32 p1);
@@ -1687,6 +1688,7 @@ def      = true
 str      = STR_CONFIG_SETTING_TRAIN_SPEED_ADAPTION
 strhelp  = STR_CONFIG_SETTING_TRAIN_SPEED_ADAPTION_HELPTEXT
 cat      = SC_EXPERT
+proc     = TrainSpeedAdaptionChanged
 patxname = ""train_speed_adaption.vehicle.train_speed_adaption""
 
 [SDT_BOOL]