Plan of railways through Williamthorpe Colliery Coloured to show track owned and maintained by the British Railway Board (red) and the National Coal Board (blue). The blue hatched black is owned by the National Coal Board and maintained by the British Railways Board. Also showing the leasehold boundary Scale: 132' to 1' Size: 109 x 32 cm Captioned D.C.E. NOTTM May '69 NM 28/69 May 1969