As it stood, the tunnel was only 'finished' in March 1861 although, at the time, it was exposed rock without a brick lining and required further work to complete it. The long approach cuttings were also unfinished at this time.
In March 1861, the tunnel was only considered complete; however, it had no brick lining and required further construction. Similarly, the long approach cuttings were unfinished at this point in time.