diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -456,6 +456,8 @@ CommandCost CmdAlterGroup(TileIndex tile
 		InvalidateWindowData(WC_REPLACE_VEHICLE, g->vehicle_type, 1);
 		InvalidateWindowData(GetWindowClassForVehicleType(g->vehicle_type), VehicleListIdentifier(VL_GROUP_LIST, g->vehicle_type, _current_company).Pack());
 		InvalidateWindowData(WC_COMPANY_COLOUR, g->owner, g->vehicle_type);
+		InvalidateWindowClassesData(WC_VEHICLE_VIEW);
+		InvalidateWindowClassesData(WC_VEHICLE_DETAILS);
 	}
 
 	return CommandCost();
@@ -545,6 +547,8 @@ CommandCost CmdAddVehicleGroup(TileIndex
 		SetWindowDirty(WC_VEHICLE_VIEW, v->index);
 		SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
 		InvalidateWindowData(GetWindowClassForVehicleType(v->type), VehicleListIdentifier(VL_GROUP_LIST, v->type, _current_company).Pack());
+		InvalidateWindowData(WC_VEHICLE_VIEW, v->index);
+		InvalidateWindowData(WC_VEHICLE_DETAILS, v->index);
 	}
 
 	return CommandCost();
diff --git a/src/lang/english.txt b/src/lang/english.txt
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -5037,6 +5037,7 @@ STR_FORMAT_BUOY_NAME                    
 STR_FORMAT_BUOY_NAME_SERIAL                                     :{TOWN} Buoy #{COMMA}
 STR_FORMAT_COMPANY_NUM                                          :(Company {COMMA})
 STR_FORMAT_GROUP_NAME                                           :Group {COMMA}
+STR_FORMAT_GROUP_VEHICLE_NAME                                   :{GROUP} #{COMMA}
 STR_FORMAT_INDUSTRY_NAME                                        :{TOWN} {STRING}
 STR_FORMAT_WAYPOINT_NAME                                        :{TOWN} Waypoint
 STR_FORMAT_WAYPOINT_NAME_SERIAL                                 :{TOWN} Waypoint #{COMMA}
diff --git a/src/strings.cpp b/src/strings.cpp
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -1467,6 +1467,11 @@ static char *FormatString(char *buff, co
 					int64 args_array[] = {(int64)(size_t)v->name.c_str()};
 					StringParameters tmp_params(args_array);
 					buff = GetStringWithArgs(buff, STR_JUST_RAW_STRING, &tmp_params, last);
+				} else if (v->group_id != DEFAULT_GROUP) {
+					/* The vehicle has no name, but is member of a group, so print group name */
+					int64 args_array[] = {v->group_id, v->unitnumber};
+					StringParameters tmp_params(args_array);
+					buff = GetStringWithArgs(buff, STR_FORMAT_GROUP_VEHICLE_NAME, &tmp_params, last);
 				} else {
 					int64 args_array[] = {v->unitnumber};
 					StringParameters tmp_params(args_array);