1 files changed, 19 insertions, 9 deletions

diff --git a/src/Blocks/BlockRail.h b/src/Blocks/BlockRail.h
index 55cadfa48..da3783d08 100644
--- a/src/Blocks/BlockRail.h
+++ b/src/Blocks/BlockRail.h
@@ -186,25 +186,35 @@ public:
 		}
 		if (RailsCnt > 1)
 		{
-			if      (Neighbors[3] && Neighbors[0]) return E_META_RAIL_CURVED_ZP_XP;
-			else if (Neighbors[3] && Neighbors[1]) return E_META_RAIL_CURVED_ZP_XM;
-			else if (Neighbors[2] && Neighbors[0]) return E_META_RAIL_CURVED_ZM_XP;
-			else if (Neighbors[2] && Neighbors[1]) return E_META_RAIL_CURVED_ZM_XM;
+			if      (Neighbors[3] && Neighbors[0] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZP_XP;
+			else if (Neighbors[3] && Neighbors[1] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZP_XM;
+			else if (Neighbors[2] && Neighbors[0] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZM_XP;
+			else if (Neighbors[2] && Neighbors[1] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZM_XM;
 			else if (Neighbors[7] && Neighbors[2]) return E_META_RAIL_ASCEND_ZP;
 			else if (Neighbors[3] && Neighbors[6]) return E_META_RAIL_ASCEND_ZM;
 			else if (Neighbors[5] && Neighbors[0]) return E_META_RAIL_ASCEND_XM;
 			else if (Neighbors[4] && Neighbors[1]) return E_META_RAIL_ASCEND_XP;
 			else if (Neighbors[0] && Neighbors[1]) return E_META_RAIL_XM_XP;
 			else if (Neighbors[2] && Neighbors[3]) return E_META_RAIL_ZM_ZP;
-			ASSERT(!"Weird neighbor count");
+
+			if (CanThisRailCurve())
+			{
+				ASSERT(!"Weird neighbor count");
+			}
 		}
 		return Meta;
 	}
 
 
+	inline bool CanThisRailCurve(void)
+	{
+		return m_BlockType == E_BLOCK_RAIL;
+	}
+
+
 	bool IsUnstable(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ)
 	{
-		if (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) != E_BLOCK_RAIL)
+		if (!IsBlockRail(a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ)))
 		{
 			return false;
 		}
@@ -339,11 +349,11 @@ public:
 	{
 		AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, false);
 		NIBBLETYPE Meta;
-		if (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) != E_BLOCK_RAIL)
+		if (!IsBlockRail(a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ)))
 		{
-			if ((a_World->GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ) != E_BLOCK_RAIL) || (a_Pure != E_PURE_UPDOWN))
+			if (!IsBlockRail(a_World->GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ)) || (a_Pure != E_PURE_UPDOWN))
 			{
-				if ((a_World->GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ) != E_BLOCK_RAIL) || (a_Pure == E_PURE_NONE))
+				if (!IsBlockRail(a_World->GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ)) || (a_Pure == E_PURE_NONE))
 				{
 					return true;
 				}