diff --git a/src/station.cpp b/src/station.cpp
index 80b039d787..416c41ea1d 100644
--- a/src/station.cpp
+++ b/src/station.cpp
@@ -403,7 +403,7 @@ RoadStop *RoadStop::AllocateRaw( void )
 	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.
 	 * TODO - This is just a temporary stage, this will be removed. */
 	for (rs = GetRoadStop(0); rs != NULL; rs = (rs->index + 1U < GetRoadStopPoolSize()) ? GetRoadStop(rs->index + 1U) : NULL) {
-		if (!IsValidRoadStop(rs)) {
+		if (!rs->IsValid()) {
 			RoadStopID index = rs->index;
 
 			memset(rs, 0, sizeof(*rs));
@@ -418,3 +418,9 @@ RoadStop *RoadStop::AllocateRaw( void )
 
 	return NULL;
 }
+
+/** Determines whether a RoadStop is a valid (i.e. existing) one */
+bool RoadStop::IsValid() const
+{
+	return xy != INVALID_TILE;
+}
diff --git a/src/station.h b/src/station.h
index b4365d2baf..0202e72096 100644
--- a/src/station.h
+++ b/src/station.h
@@ -64,6 +64,8 @@ typedef struct RoadStop {
 	void *operator new (size_t size, int index);
 	void operator delete(void *rs, int index);
 
+	bool IsValid() const;
+protected:
 	static RoadStop *AllocateRaw(void);
 } RoadStop;
 
@@ -253,15 +255,7 @@ static inline bool IsValidStationID(StationID index)
 
 DECLARE_OLD_POOL(RoadStop, RoadStop, 5, 2000)
 
-/**
- * Check if a RaodStop really exists.
- */
-static inline bool IsValidRoadStop(const RoadStop *rs)
-{
-	return rs->xy != INVALID_TILE;
-}
-
-#define FOR_ALL_ROADSTOPS_FROM(rs, start) for (rs = GetRoadStop(start); rs != NULL; rs = (rs->index + 1U < GetRoadStopPoolSize()) ? GetRoadStop(rs->index + 1U) : NULL) if (IsValidRoadStop(rs))
+#define FOR_ALL_ROADSTOPS_FROM(rs, start) for (rs = GetRoadStop(start); rs != NULL; rs = (rs->index + 1U < GetRoadStopPoolSize()) ? GetRoadStop(rs->index + 1U) : NULL) if (rs->IsValid())
 #define FOR_ALL_ROADSTOPS(rs) FOR_ALL_ROADSTOPS_FROM(rs, 0)
 
 /* End of stuff for ROADSTOPS */