diff --git a/src/pbs.cpp b/src/pbs.cpp
new file mode 100644
--- /dev/null
+++ b/src/pbs.cpp
@@ -0,0 +1,43 @@
+/* $Id$ */
+
+/** @file pbs.cpp */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "pbs.h"
+#include "rail_map.h"
+#include "road_map.h"
+#include "station_map.h"
+#include "tunnelbridge_map.h"
+
+/**
+ * Get the reserved trackbits for any tile, regardless of type.
+ * @param t the tile
+ * @return the reserved trackbits. TRACK_BIT_NONE on nothing reserved or
+ *     a tile without rail.
+ */
+TrackBits GetReservedTrackbits(TileIndex t)
+{
+	switch (GetTileType(t)) {
+		case MP_RAILWAY:
+			if (IsRailWaypoint(t) || IsRailDepot(t)) return GetRailWaypointReservation(t);
+			if (IsPlainRailTile(t)) return GetTrackReservation(t);
+			break;
+
+		case MP_ROAD:
+			if (IsLevelCrossing(t)) return GetRailCrossingReservation(t);
+			break;
+
+		case MP_STATION:
+			if (IsRailwayStation(t)) return GetRailStationReservation(t);
+			break;
+
+		case MP_TUNNELBRIDGE:
+			if (GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL) return GetRailTunnelBridgeReservation(t);
+			break;
+
+		default:
+			break;
+	}
+	return TRACK_BIT_NONE;
+}