Feature: Add NotRoadTypes (NRT)

src/widgets/autoreplace_widget.h

@@ -34,9 +34,11 @@ enum ReplaceVehicleWidgets {
 	WID_RV_INFO_TAB,                 ///< Info tab.
 	WID_RV_STOP_REPLACE,             ///< Stop Replacing button.
 
+	/* Train/road only widgets */
+	WID_RV_RAIL_ROAD_TYPE_DROPDOWN,  ///< Dropdown menu about the rail/roadtype.
+
 	/* Train only widgets. */
 	WID_RV_TRAIN_ENGINEWAGON_DROPDOWN, ///< Dropdown to select engines and/or wagons.
-	WID_RV_TRAIN_RAILTYPE_DROPDOWN,  ///< Dropdown menu about the railtype.
 	WID_RV_TRAIN_WAGONREMOVE_TOGGLE, ///< Button to toggle removing wagons.
 };