--- a/newgrf_station.c	Sat May 06 21:46:26 2006 +0000
+++ b/newgrf_station.c	Sat May 06 22:08:14 2006 +0000
@@ -640,3 +640,22 @@
 	return true;
 }
 
+/* Check if a rail station tile is traversable.
+ * XXX This could be cached (during build) in the map array to save on all the dereferencing */
+bool IsStationTileBlocked(TileIndex tile)
+{
+	const Station *st;
+	const StationSpec *statspec;
+	uint specindex;
+
+	if (!IsCustomStationSpecIndex(tile)) return false;
+
+	st = GetStationByTile(tile);
+	specindex = GetCustomStationSpecIndex(tile);
+	if (specindex >= st->num_specs) return false;
+
+	statspec = st->speclist[specindex].spec;
+	if (statspec == NULL) return false;
+
+	return HASBIT(statspec->blocked, GetStationGfx(tile));
+}

--- a/newgrf_station.h	Sat May 06 21:46:26 2006 +0000
+++ b/newgrf_station.h	Sat May 06 22:08:14 2006 +0000
@@ -102,6 +102,9 @@
 SpriteID GetCustomStationRelocation(const StationSpec *statspec, const Station *st, TileIndex tile);
 uint16 GetStationCallback(uint16 callback, uint32 param1, uint32 param2, const StationSpec *statspec, const Station *st, TileIndex tile);
 
+/* Check if a rail station tile is traversable. */
+bool IsStationTileBlocked(TileIndex tile);
+
 /* Allocate a StationSpec to a Station. This is called once per build operation. */
 int AllocateSpecToStation(const StationSpec *statspec, Station *st, bool exec);
 

--- a/station_cmd.c	Sat May 06 21:46:26 2006 +0000
+++ b/station_cmd.c	Sat May 06 22:08:14 2006 +0000
@@ -2124,6 +2124,8 @@
 	switch (mode) {
 		case TRANSPORT_RAIL:
 			if (IsRailwayStation(tile)) {
+				if (IsStationTileBlocked(tile)) return 0;
+
 				return TrackToTrackBits(GetRailStationTrack(tile)) * 0x101;
 			}
 			break;

--- a/station_map.h	Sat May 06 21:46:26 2006 +0000
+++ b/station_map.h	Sat May 06 22:08:14 2006 +0000
@@ -187,7 +187,8 @@
 	return
 		IsRailwayStationTile(t1) &&
 		IsCompatibleRail(GetRailType(t1), GetRailType(t2)) &&
-		GetRailStationAxis(t1) == GetRailStationAxis(t2);
+		GetRailStationAxis(t1) == GetRailStationAxis(t2) &&
+		!IsStationTileBlocked(t1);
 }