50008 Thunderer passes Up Hatherley on 7 July 2017 with the 4Z01 08:50 Okehampton to Chaddesden Sidings, conveying Network Rail rail grinders DR79304, DR79303, DR79302 & DR79301. This was running exactly one hour early. Although Thunderer never did much real engineer's work once it had been painted into this 'Laira Blue' livery in 1991, this still invokes the good old days of DCWA allocated departmental Class 50 workings.