(svn r8621) -Codechange: assigned new numbers to the VEH_(type) enum so that VEH_Train is 0, VEH_Road is 1 and so on

This means that "v->type" can be used as array indexes instead of VehTypeToIndex() (or "v->type - VEH_Train/0x10 as the code still used in some places)
  Surprisingly this can be done without changing the savegame format

src/newgrf.cpp

@@ -3617,7 +3617,7 @@ static void CalculateRefitMasks(void)
 							RailVehInfo(engine)->railveh_type != RAILVEH_WAGON
 						)
 					)) {
-				xor_mask = _default_refitmasks[GetEngine(engine)->type - VEH_Train];
+				xor_mask = _default_refitmasks[GetEngine(engine)->type];
 			}
 		}
 		_engine_info[engine].refit_mask = ((mask & ~not_mask) ^ xor_mask) & _landscape_global_cargo_mask[_opt.landscape];