when it was again withdrawn, eventually being scrapped by Vic Berry. Subsequently, other training locomotives were numbered in the ADB 968xxx series. 97203–97204 These locomotives were converted from Class 31 locomotives. The first, no. 97203, was operated by the Railway Technical Centre, based at Derby. It was used to haul various test-trains operated by the centre. However, in 1987, the locomotive was written off after having sustained fire damage. Therefore, a replacement in the form of 97204 was converted. This later returned to normal traffic, as no. 31970. Both locomotives were painted in RTC's red/cream livery with a black bodyside band. 97205 This was former Class 31 locomotive 31163, currently based at Chinnor & Princes Risborough Railway in Derby RTC livery. 97250–97252 Three former Class 25 locomotives were converted for use as mobile generators to provide electric heating on trains where the hauling locomotive could not supply this, including the Caledonian Sleeper. They were referred to as ETHEL units (Electric Train Heating Ex-Locomotives), and unofficially named Ethel 1, Ethel 2 and Ethel 3. They were painted in a blue/grey livery in an effort to match the coaching stock livery of the day, but this was not too successful. All three have since been scrapped. 97301–97304 These locomotives have been refurbished from Class 37 locomotives at Barrow Hill Roundhouse by Network Rail and have been fitted with ERTMS signalling equipment. They are intended for use primarily on the Cambrian lines from Shrewsbury to Aberystwyth and Pwllheli, which requires an ERTMS-capable fleet. The locomotives were formerly 37100, 37170, 37178 and 37217 respectively. A new inspection shed was built in 2008 at Coleham (Sutton Bridge Junction) in Shrewsbury for these locos. On 2 September 2009, one of the locomotives (97303) hit a car on an unmanned level crossing near Penrhyndeudraeth, killing the car's driver. 97401–97402 97401 was a Class 46 'Peak' locomotive, bought by the Derby-based Railway Technical Centre straight from British Rail service in 1984. This locomotive did not receive its allocated departmental number and retained its original number of 46009. It was used in a high-publicity test, to prove the safety of rail transported nuclear flasks. The locomotive was deliberately crashed into a container at . Whilst the locomotive was written off, the flask was undamaged. A second locomotive, no. 46023, was allocated the departmental number 97402. It was cannibalised for spare parts, to allow no. 46009 to reach the required