 The NSR is one of the few railways to become the subject of a play . In 1966 , Peter Cheeseman , artistic director of The Victoria Theatre , Stoke wrote a musical documentary about the NSR called The Knotty . Featured in the play were the voices of several NSR staff who had been interviewed especially for the play . The script with introductory notes by Cheeseman was published in 1970 . Sound recordings of the production , The Knotty - a musical documentary , was released on LP by Argo <unk> ( <unk> 125 ) in 1970 and as a digital version in 2014 it was digitised by <unk> Digital . 
