Index: src/articulated_vehicles.cpp
===================================================================
--- src/articulated_vehicles.cpp	(revision 13864)
+++ src/articulated_vehicles.cpp	(working copy)
@@ -298,6 +298,8 @@
 				u->cargo_type = rvi_artic->cargo_type;
 				u->cargo_cap = rvi_artic->capacity;
 
+				u->u.road.cached_override = GetWagonOverrideSpriteSet(u->engine_type, u->cargo_type, u->u.road.first_engine);
+
 				SetRoadVehArticPart(u);
 			} break;
 		}
Index: src/roadveh_cmd.cpp
===================================================================
--- src/roadveh_cmd.cpp	(revision 13864)
+++ src/roadveh_cmd.cpp	(working copy)
@@ -163,6 +163,8 @@
 
 		/* Update the length of the vehicle. */
 		u->u.road.cached_veh_length = GetRoadVehLength(u);
+
+		u->u.road.cached_override = GetWagonOverrideSpriteSet(u->engine_type, u->cargo_type, u->u.road.first_engine);
 	}
 }
 
Index: src/newgrf_engine.cpp
===================================================================
--- src/newgrf_engine.cpp	(revision 13864)
+++ src/newgrf_engine.cpp	(working copy)
@@ -859,6 +859,9 @@
 			 * as v->cargo_type is temporary changed to the new type */
 			group = use_cache ? v->u.rail.cached_override : GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, v->u.rail.first_engine);
 			if (group != NULL) return group;
+		} else if (v->type == VEH_ROAD) {
+			group = use_cache ? v->u.road.cached_override : GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, v->u.road.first_engine);
+			if (group != NULL) return group;
 		}
 	}
 
Index: src/vehicle_base.h
===================================================================
--- src/vehicle_base.h	(revision 13864)
+++ src/vehicle_base.h	(working copy)
@@ -167,6 +167,9 @@
 	EngineID first_engine;
 	byte cached_veh_length;
 
+	/* Cached wagon override spritegroup */
+	const struct SpriteGroup *cached_override;
+
 	RoadType roadtype;
 	RoadTypes compatible_roadtypes;
 };