diff --git a/tile.c b/tile.c
index f18932c3f3..5d5056a95d 100644
--- a/tile.c
+++ b/tile.c
@@ -68,3 +68,19 @@ uint GetTileZ(TileIndex tile)
 	GetTileSlope(tile, &h);
 	return h;
 }
+
+uint GetTileMaxZ(TileIndex t)
+{
+	uint max;
+	uint h;
+
+	h = TileHeight(t);
+	max = h;
+	h = TileHeight(t + TileDiffXY(1, 0));
+	if (h > max) max = h;
+	h = TileHeight(t + TileDiffXY(0, 1));
+	if (h > max) max = h;
+	h = TileHeight(t + TileDiffXY(1, 1));
+	if (h > max) max = h;
+	return max * 8;
+}
diff --git a/tile.h b/tile.h
index 90a2941063..65d2c31f2d 100644
--- a/tile.h
+++ b/tile.h
@@ -50,6 +50,7 @@ uint GetMapExtraBits(TileIndex tile);
 uint GetTileh(uint n, uint w, uint e, uint s, uint *h);
 uint GetTileSlope(TileIndex tile, uint *h);
 uint GetTileZ(TileIndex tile);
+uint GetTileMaxZ(TileIndex tile);
 
 static inline bool CorrectZ(uint tileh)
 {
diff --git a/tunnelbridge_cmd.c b/tunnelbridge_cmd.c
index aba652c0c7..d8ee7d9277 100644
--- a/tunnelbridge_cmd.c
+++ b/tunnelbridge_cmd.c
@@ -1208,23 +1208,6 @@ static inline DiagDirection GetBridgeRampDirection(TileIndex t) {return (DiagDir
 static inline bool IsTransportUnderBridge(TileIndex t) {return HASBIT(_m[t].m5, 5);}
 static inline uint GetBridgeAxis(TileIndex t) {return GB(_m[t].m5, 0, 1);}
 
-static uint GetTileMaxZ(TileIndex t)
-{
-	uint max;
-	uint h;
-
-	h = TileHeight(t);
-	max = h;
-	h = TileHeight(t + TileDiffXY(1, 0));
-	if (h > max) max = h;
-	h = TileHeight(t + TileDiffXY(0, 1));
-	if (h > max) max = h;
-	h = TileHeight(t + TileDiffXY(1, 1));
-	if (h > max) max = h;
-	return max * 8;
-}
-
-
 static uint GetSlopeZ_TunnelBridge(const TileInfo* ti)
 {
 	TileIndex tile = ti->tile;