--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -485,19 +485,19 @@
 	}
 
 	/* in version 2.1 of the savegame, town owner was unified. */
-	if (CheckSavegameVersionOldStyle(2, 1)) ConvertTownOwner();
+	if (IsSavegameVersionBefore(2, 1)) ConvertTownOwner();
 
 	/* from version 4.1 of the savegame, exclusive rights are stored at towns */
-	if (CheckSavegameVersionOldStyle(4, 1)) UpdateExclusiveRights();
+	if (IsSavegameVersionBefore(4, 1)) UpdateExclusiveRights();
 
 	/* from version 4.2 of the savegame, currencies are in a different order */
-	if (CheckSavegameVersionOldStyle(4, 2)) UpdateCurrencies();
+	if (IsSavegameVersionBefore(4, 2)) UpdateCurrencies();
 
 	/* In old version there seems to be a problem that water is owned by
 	 * OWNER_NONE, not OWNER_WATER.. I can't replicate it for the current
 	 * (4.3) version, so I just check when versions are older, and then
 	 * walk through the whole map.. */
-	if (CheckSavegameVersionOldStyle(4, 3)) {
+	if (IsSavegameVersionBefore(4, 3)) {
 		for (TileIndex t = 0; t < map_size; t++) {
 			if (IsTileType(t, MP_WATER) && GetTileOwner(t) >= MAX_COMPANIES) {
 				SetTileOwner(t, OWNER_WATER);
@@ -576,7 +576,7 @@
 	}
 
 	/* The value of _date_fract got divided, so make sure that old games are converted correctly. */
-	if (CheckSavegameVersionOldStyle(11, 1) || (CheckSavegameVersion(147) && _date_fract > DAY_TICKS)) _date_fract /= 885;
+	if (IsSavegameVersionBefore(11, 1) || (CheckSavegameVersion(147) && _date_fract > DAY_TICKS)) _date_fract /= 885;
 
 	/* Update current year
 	 * must be done before loading sprites as some newgrfs check it */
@@ -594,7 +594,7 @@
 
 	/* Connect front and rear engines of multiheaded trains and converts
 	 * subtype to the new format */
-	if (CheckSavegameVersionOldStyle(17, 1)) ConvertOldMultiheadToNew();
+	if (IsSavegameVersionBefore(17, 1)) ConvertOldMultiheadToNew();
 
 	/* Connect front and rear engines of multiheaded trains */
 	ConnectMultiheadedTrains();
@@ -773,12 +773,12 @@
 
 	/* In version 2.2 of the savegame, we have new airports, so status of all aircraft is reset.
 	 * This has to be called after the oilrig airport_type update above ^^^ ! */
-	if (CheckSavegameVersionOldStyle(2, 2)) UpdateOldAircraft();
+	if (IsSavegameVersionBefore(2, 2)) UpdateOldAircraft();
 
 	/* In version 6.1 we put the town index in the map-array. To do this, we need
 	 *  to use m2 (16bit big), so we need to clean m2, and that is where this is
 	 *  all about ;) */
-	if (CheckSavegameVersionOldStyle(6, 1)) {
+	if (IsSavegameVersionBefore(6, 1)) {
 		for (TileIndex t = 0; t < map_size; t++) {
 			switch (GetTileType(t)) {
 				case MP_HOUSE:
@@ -1101,7 +1101,7 @@
 	/* In version 16.1 of the savegame a company can decide if trains, which get
 	 * replaced, shall keep their old length. In all prior versions, just default
 	 * to false */
-	if (CheckSavegameVersionOldStyle(16, 1)) {
+	if (IsSavegameVersionBefore(16, 1)) {
 		Company *c;
 		FOR_ALL_COMPANIES(c) c->settings.renew_keep_length = false;
 	}

--- a/src/saveload/order_sl.cpp
+++ b/src/saveload/order_sl.cpp
@@ -129,7 +129,7 @@
 
 static void Load_ORDR()
 {
-	if (CheckSavegameVersionOldStyle(5, 2)) {
+	if (IsSavegameVersionBefore(5, 2)) {
 		/* Version older than 5.2 did not have a ->next pointer. Convert them
 		 * (in the old days, the orderlist was 5000 items big) */
 		size_t len = SlGetFieldLength();
@@ -148,7 +148,7 @@
 			}
 
 			free(orders);
-		} else if (CheckSavegameVersionOldStyle(5, 2)) {
+		} else if (IsSavegameVersionBefore(5, 2)) {
 			len /= sizeof(uint32);
 			uint32 *orders = MallocT<uint32>(len + 1);
 
@@ -187,7 +187,7 @@
 static void Ptrs_ORDR()
 {
 	/* Orders from old savegames have pointers corrected in Load_ORDR */
-	if (CheckSavegameVersionOldStyle(5, 2)) return;
+	if (IsSavegameVersionBefore(5, 2)) return;
 
 	Order *o;
 

--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -1141,7 +1141,7 @@
 
 	/* After version 4.3 REF_VEHICLE_OLD is saved as REF_VEHICLE,
 	 * and should be loaded like that */
-	if (rt == REF_VEHICLE_OLD && !CheckSavegameVersionOldStyle(4, 4)) {
+	if (rt == REF_VEHICLE_OLD && !IsSavegameVersionBefore(4, 4)) {
 		rt = REF_VEHICLE;
 	}
 
@@ -1160,7 +1160,7 @@
 		case REF_ORDER:
 			if (Order::IsValidID(index)) return Order::Get(index);
 			/* in old versions, invalid order was used to mark end of order list */
-			if (CheckSavegameVersionOldStyle(5, 2)) return NULL;
+			if (IsSavegameVersionBefore(5, 2)) return NULL;
 			SlErrorCorrupt("Referencing invalid Order");
 
 		case REF_VEHICLE_OLD:

--- a/src/saveload/saveload.h
+++ b/src/saveload/saveload.h
@@ -453,7 +453,7 @@
  * @param minor Minor number of the version to check against.
  * @return Savegame version is less than the \a major version, or has equal \a major version and a smaller \a minor version.
  */
-static inline bool CheckSavegameVersionOldStyle(uint16 major, byte minor)
+static inline bool IsSavegameVersionBefore(uint16 major, byte minor)
 {
 	extern uint16 _sl_version;
 	extern byte   _sl_minor_version;

--- a/src/saveload/signs_sl.cpp
+++ b/src/saveload/signs_sl.cpp
@@ -50,7 +50,7 @@
 		 *  - we can't use IsValidCompany() now, so this is fixed in AfterLoadGame()
 		 * All signs that were saved are valid (including those with just 'Sign' and INVALID_OWNER).
 		 *  - so set owner to OWNER_NONE if needed (signs from pre-version 6.1 would be lost) */
-		if (CheckSavegameVersionOldStyle(6, 1) || (CheckSavegameVersion(83) && si->owner == INVALID_OWNER)) {
+		if (IsSavegameVersionBefore(6, 1) || (CheckSavegameVersion(83) && si->owner == INVALID_OWNER)) {
 			si->owner = OWNER_NONE;
 		}
 	}

--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -275,7 +275,7 @@
 					} else {
 						v->orders.list = mapping[v->orders.old];
 						/* For old games (case a) we must create the shared vehicle chain */
-						if (CheckSavegameVersionOldStyle(5, 2)) {
+						if (IsSavegameVersionBefore(5, 2)) {
 							v->AddToShared(v->orders.list->GetFirstSharedVehicle());
 						}
 					}
@@ -357,7 +357,7 @@
 			}
 			/* trains weren't stopping gradually in old OTTD versions (and TTO/TTD)
 			 * other vehicle types didn't have zero speed while stopped (even in 'recent' OTTD versions) */
-			if ((v->vehstatus & VS_STOPPED) && (v->type != VEH_TRAIN || CheckSavegameVersionOldStyle(2, 1))) {
+			if ((v->vehstatus & VS_STOPPED) && (v->type != VEH_TRAIN || IsSavegameVersionBefore(2, 1))) {
 				v->cur_speed = 0;
 			}
 		}