(svn r21924) -Codechange: Unify some parts of the articulated vehicle code.

-Cleanup: Avoid conversions to Train and RoadVehicle that are no longer required.

src/industry_cmd.cpp

@@ -2298,7 +2298,7 @@ static int WhoCanServiceIndustry(Industry *ind)
 		/* Check whether it accepts the right kind of cargo */
 		bool c_accepts = false;
 		bool c_produces = false;
-		if (v->type == VEH_TRAIN && Train::From(v)->IsFrontEngine()) {
+		if (v->type == VEH_TRAIN && v->IsFrontEngine()) {
 			for (const Vehicle *u = v; u != NULL; u = u->Next()) {
 				CanCargoServiceIndustry(u->cargo_type, ind, &c_accepts, &c_produces);
 			}