As far as I know there is no access to the tunnel that runs under New Hall approach towards Overton and Emroyd common. The main remains of this railway, are the ancient Viaduct near Lane End Colliery Flockton the Tunnel (Collapsed) mentioned before, the line of the railway along the top of Emroyd common, then it went down into Emroyd itself. You can pick it up again at Smithy Brook and not sure about access but it follows the slight valley to Horbury bridge,. If you look on my ADITNOW page there is a map giving the line of it.