diff --git a/src/main/java/net/minecraft/block/BlockRailBase.java b/src/main/java/net/minecraft/block/BlockRailBase.java
index 801d933..0a76bd0 100644
--- a/src/main/java/net/minecraft/block/BlockRailBase.java
+++ b/src/main/java/net/minecraft/block/BlockRailBase.java
@@ -206,7 +206,7 @@
 	 */
 	public boolean isFlexibleRail(IBlockAccess world, int y, int x, int z)
 	{
-		return isPowered();
+		return !isPowered();
 	}
 
 	/**
@@ -318,7 +318,7 @@
 			this.field_150659_e = p_i45388_5_;
 			BlockRailBase block = (BlockRailBase)p_i45388_2_.getBlock(p_i45388_3_, p_i45388_4_, p_i45388_5_);
 			int l = block.getBasicRailMetadata(p_i45388_2_, null, p_i45388_3_, p_i45388_4_, p_i45388_5_);
-			this.field_150656_f = block.isFlexibleRail(p_i45388_2_, p_i45388_3_, p_i45388_4_, p_i45388_5_);
+			this.field_150656_f = !block.isFlexibleRail(p_i45388_2_, p_i45388_3_, p_i45388_4_, p_i45388_5_);
 			canMakeSlopes = block.canMakeSlopes(p_i45388_2_, p_i45388_3_, p_i45388_4_, p_i45388_5_);
 			this.func_150648_a(l);
 		}
diff --git a/src/main/java/net/minecraft/world/gen/ChunkProviderGenerate.java b/src/main/java/net/minecraft/world/gen/ChunkProviderGenerate.java
index a0da5c0..54f5d59 100644
--- a/src/main/java/net/minecraft/world/gen/ChunkProviderGenerate.java
+++ b/src/main/java/net/minecraft/world/gen/ChunkProviderGenerate.java
@@ -182,7 +182,7 @@
 
 	public void replaceBlocksForBiome(int p_147422_1_, int p_147422_2_, Block[] p_147422_3_, byte[] p_147422_4_, BiomeGenBase[] p_147422_5_)
 	{
-		ChunkProviderEvent.ReplaceBiomeBlocks event = new ChunkProviderEvent.ReplaceBiomeBlocks(this, p_147422_1_, p_147422_2_, p_147422_3_, p_147422_5_);
+		ChunkProviderEvent.ReplaceBiomeBlocks event = new ChunkProviderEvent.ReplaceBiomeBlocks(this, p_147422_1_, p_147422_2_, p_147422_3_, p_147422_4_, p_147422_5_);
 		MinecraftForge.EVENT_BUS.post(event);
 		if (event.getResult() == Result.DENY) return;
 
diff --git a/src/main/java/net/minecraftforge/event/terraingen/ChunkProviderEvent.java b/src/main/java/net/minecraftforge/event/terraingen/ChunkProviderEvent.java
index baebb57..ea1d02d 100644
--- a/src/main/java/net/minecraftforge/event/terraingen/ChunkProviderEvent.java
+++ b/src/main/java/net/minecraftforge/event/terraingen/ChunkProviderEvent.java
@@ -27,6 +27,7 @@
 		public final int chunkX;
 		public final int chunkZ;
 		public final Block[] blockArray;
+		public final byte[] metaArray;
 		public final BiomeGenBase[] biomeArray;
 		
 		public ReplaceBiomeBlocks(IChunkProvider chunkProvider, int chunkX, int chunkZ, Block[] blockArray, BiomeGenBase[] biomeArray)
@@ -36,6 +37,17 @@
 			this.chunkZ = chunkZ;
 			this.blockArray = blockArray;
 			this.biomeArray = biomeArray;
+			metaArray = new byte[256];
+		}
+		
+		public ReplaceBiomeBlocks(IChunkProvider chunkProvider, int chunkX, int chunkZ, Block[] blockArray, byte[] metaArray, BiomeGenBase[] biomeArray)
+		{
+			super(chunkProvider);
+			this.chunkX = chunkX;
+			this.chunkZ = chunkZ;
+			this.blockArray = blockArray;
+			this.biomeArray = biomeArray;
+			this.metaArray = metaArray;
 		}
 	   
 	}