the minecraft code that crashed:

railControlBlock.java

package tutorial.generic;

import net.minecraft.block.Block;
import net.minecraft.block.BlockRail;
import net.minecraft.block.BlockRailBase;
import net.minecraft.block.ITileEntityProvider;
import net.minecraft.block.material.Material;
import net.minecraft.block.properties.IProperty;
import net.minecraft.block.properties.PropertyEnum;
import net.minecraft.block.state.BlockState;
import net.minecraft.block.state.IBlockState;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.BlockPos;
import net.minecraft.util.IStringSerializable;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.registry.GameRegistry;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class railControlBlock extends BlockRail implements ITileEntityProvider {

	public static final PropertyEnum PART = PropertyEnum.create("part", EnumPartType.class);
	public static final PropertyEnum SHAPE = PropertyEnum.create("shape", BlockRailBase.EnumRailDirection.class);
	
	private static String name = "railControlBlock";
	private int part;
	
    public railControlBlock(int pnum) {
    	
        super();
        GameRegistry.registerTileEntity(railControl.class, name);
        if(pnum == 0) {
        	setDefaultState(this.blockState.getBaseState().withProperty(PART, EnumPartType.MIDDLE).withProperty(SHAPE, BlockRailBase.EnumRailDirection.NORTH_SOUTH));
        	this.part = 0;
        }else if(pnum == 1){
        	setDefaultState(this.blockState.getBaseState().withProperty(PART, EnumPartType.LEFT).withProperty(SHAPE, BlockRailBase.EnumRailDirection.NORTH_SOUTH));
        }else if(pnum == 2){
        	setDefaultState(this.blockState.getBaseState().withProperty(PART, EnumPartType.RIGHT).withProperty(SHAPE, BlockRailBase.EnumRailDirection.NORTH_SOUTH));
        }
        
        GameRegistry.registerBlock(this, name);
        this.setCreativeTab(CreativeTabs.tabMisc);
        this.setUnlocalizedName(name);
        this.setHardness(2.0f);
        setBlockBounds();
        this.setResistance(6.0f);
        this.setHarvestLevel("pickaxe", 2);
        this.isBlockContainer = true;
        
    }
    
    @Override
    public String toString() {
        return getName();
    }
    
    
    
  

	@Override
	public TileEntity createNewTileEntity(World worldIn, int meta) {
		return new railControl();
	}
	
	
	
	public static String getName(){
    	return name;
    }
	
	 
	  
	  @SideOnly(Side.CLIENT)
	  public AxisAlignedBB getSelectedBoundingBox(World worldIn, BlockPos pos)
	  {
	    setBlockBoundsBasedOnState(worldIn, pos);
	    return super.getSelectedBoundingBox(worldIn, pos);
	  }
	
	public IProperty getShapeProperty()
	  {
	    return SHAPE;
	  }
	
	public IProperty getPartProperty()
	  {
	    return PART;
	  }
	
	
	  
	  public IBlockState getStateFromMeta(int meta)
	  {
	    return getDefaultState().withProperty(PART, EnumPartType.byMetadata(meta)).withProperty(SHAPE, BlockRailBase.EnumRailDirection.byMetadata(meta));
	  }
	  
	  @Override
	    public void setBlockBoundsBasedOnState(IBlockAccess worldIn, BlockPos pos)
	    {
	        
	            setBlockBounds();
	        
	    }
	  
	  
	  private void setBlockBounds()
	  {
		  setBlockBounds(0F, 0.0F, 0F, 1F, 0.125F, 1F);
	  }
	  
	  public int getMetaFromState(IBlockState state)
	  {
	    return ((BlockRailBase.EnumRailDirection)state.getValue(SHAPE)).getMetadata();
	  }
	  
	  @Override
	  public IBlockState getActualState(IBlockState state, IBlockAccess worldIn, BlockPos pos)
	  /*     */   {
		  return state.withProperty(PART, this.part);
	  }
	  
	  protected BlockState createBlockState()
	  {
	    return new BlockState(this, new IProperty[] { PART, SHAPE });
	  }
	  
	  
	  
	  public boolean isOpaqueCube()
	  {
	  return false;
	  }
	  
	  /**
	  * If this block doesn't render as an ordinary block it will return False (examples: signs, buttons, stairs, etc)
	  */

	  public boolean renderAsNormalBlock()
	  {
	  return false;
	  }

	  public int getRenderBlockPass()
	  {
	  return 1;
	  }
	  
	  protected void onNeighborChangedInternal(World worldIn, BlockPos pos, IBlockState state, Block neighborBlock)
	  {
	    //whenever the blocks around it change
	  }
	  
	  public static enum EnumPartType
	    implements IStringSerializable
	  {
	    MIDDLE(0, "middle"),  
	    LEFT(1, "left"), 
	    RIGHT(2, "right");
		  
		private static final EnumPartType[] META_LOOKUP = new EnumPartType[values().length];
		
		private final int meta;
	    
	    private final String name;
	    
	    private EnumPartType(int meta, String name)
        {
            this.meta = meta;
            this.name = name;
        }

        public int getMetadata()
        {
            return this.meta;
        }

        public String toString()
        {
            return this.name;
        }
	    public String getName()
	    {
	      return this.name;
	    }
	    
	    public static EnumPartType byMetadata(int meta)
        {
            if (meta < 0 || meta >= META_LOOKUP.length)
            {
                meta = 0;
            }

            return META_LOOKUP[meta];
        }
	    
	    static
        {
            EnumPartType[] var0 = values();
            int var1 = var0.length;

            for (int var2 = 0; var2 < var1; ++var2)
            {
                EnumPartType var3 = var0[var2];
                META_LOOKUP[var3.getMetadata()] = var3;
            }
        }
	  }
	  
}