Area signalling network diagram, from Signalling & Telecommunications Engineer Doncaster, Railtrack Infrastructure Services North East, network within perimeter Sleights - Cleethorpes - Hull - Sunderland - Carlisle - Bradford - Leeds, c. 2000, in glazed frame, 1015 x 891mm. Sleights-Cleethorpes-Hull-Sunderland-Carlisle-Bradford-Leeds circa 2000