diff --git a/src/saveload/labelmaps_sl.cpp b/src/saveload/labelmaps_sl.cpp
--- a/src/saveload/labelmaps_sl.cpp
+++ b/src/saveload/labelmaps_sl.cpp
@@ -26,7 +26,7 @@ static SmallVector<RailTypeLabel, RAILTY
  */
 static bool NeedRailTypeConversion()
 {
-	for (uint i = 0; i < _railtype_list.Length(); i++) {
+	for (uint i = 0; i < _railtype_list.size(); i++) {
 		if ((RailType)i < RAILTYPE_END) {
 			const RailtypeInfo *rti = GetRailTypeInfo((RailType)i);
 			if (rti->label != _railtype_list[i]) return true;
@@ -44,7 +44,7 @@ void AfterLoadLabelMaps()
 	if (NeedRailTypeConversion()) {
 		SmallVector<RailType, RAILTYPE_END> railtype_conversion_map;
 
-		for (uint i = 0; i < _railtype_list.Length(); i++) {
+		for (uint i = 0; i < _railtype_list.size(); i++) {
 			RailType r = GetRailTypeByLabel(_railtype_list[i]);
 			if (r == INVALID_RAILTYPE) r = RAILTYPE_BEGIN;