tracer, District Civil Engineer's Office; trainspotting; permanent way training course "A"; draughtsman; permanent way work; continuous welded rail; permanent way renewal; concrete sleepers; senior technical assistant; computerisation renewal of ways (CROWS) ; area civil engineer; saloon inspection; track possession; North Eastern Railway; London Midland Region; Eastern Region; York; Tollerton; Scarborough; York Technical College; East Coast Main Line; Doncaster; London King's Cross; Ferrybridge; Darlington; Peterborough; Crewe; Leeds;