diff --git a/src/newgrf_station.cpp b/src/newgrf_station.cpp
index 26b49cc877..e961dd87cf 100644
--- a/src/newgrf_station.cpp
+++ b/src/newgrf_station.cpp
@@ -558,7 +558,7 @@ static const SpriteGroup *StationResolveReal(const ResolverObject *object, const
 			break;
 	}
 
-	if (HasBit(statspec->flags, 1)) cargo /= (st->trainst_w + st->trainst_h);
+	if (HasBit(statspec->flags, SSF_DIV_BY_STATION_SIZE)) cargo /= (st->trainst_w + st->trainst_h);
 	cargo = min(0xfff, cargo);
 
 	if (cargo > statspec->cargo_threshold) {
@@ -904,7 +904,7 @@ void AnimateStationTile(TileIndex tile)
 	bool frame_set_by_callback = false;
 
 	if (HasBit(ss->callbackmask, CBM_STATION_ANIMATION_NEXT_FRAME)) {
-		uint32 param = HasBit(ss->flags, 2) ? Random() : 0;
+		uint32 param = HasBit(ss->flags, SSF_CB141_RANDOM_BITS) ? Random() : 0;
 		uint16 callback = GetStationCallback(CBID_STATION_ANIM_NEXT_FRAME, param, 0, ss, st, tile);
 
 		if (callback != CALLBACK_FAILED) {
diff --git a/src/newgrf_station.h b/src/newgrf_station.h
index 9af801f05d..5bd52891b2 100644
--- a/src/newgrf_station.h
+++ b/src/newgrf_station.h
@@ -29,6 +29,14 @@ typedef TinyEnumT<StationClassID> StationClassIDByte;
 /** Allow incrementing of StationClassID variables */
 DECLARE_POSTFIX_INCREMENT(StationClassID);
 
+enum StationSpecFlags {
+	SSF_SEPARATE_GROUND,      ///< Use different sprite set for ground sprites.
+	SSF_DIV_BY_STATION_SIZE,  ///< Divide cargo amount by station size.
+	SSF_CB141_RANDOM_BITS,    ///< Callback 141 needs random bits.
+	SSF_CUSTOM_FOUNDATIONS,   ///< Draw custom foundations.
+	SSF_EXTENDED_FOUNDATIONS, ///< Extended foundation block instead of simple.
+};
+
 /* Station layout for given dimensions - it is a two-dimensional array
  * where index is computed as (x * platforms) + platform. */
 typedef byte *StationLayout;