permitted to use the units until 31 July 2020 and could be operated alone. This was later extended to 31 December 2020 for both operators. The final Class 142s were withdrawn from Northern Trains in November 2020 and Transport for Wales in December 2020. Preservation Several operational class 142 units have made it into preservation and additional sets are set to be saved/earmarked for preservation, most of which so far being ex-Northern operated units with one being an ex-Arriva Trains Wales unit. The pioneer Class 142 Unit, 142001, is part of the National Collection and preserved at the National Railway Museum Shildon. Other select units have also been purchased but will only be used to provide spare parts to the units which are planned to operate on heritage railways or museums. Operational Non-railway use Alongside the operational preserved Class 142s, some have been acquired for non-railway use. Liveries Fleet details Accidents Two Class 142 units were withdrawn through accident damage. The first of which was unit 142059, which was withdrawn in 1991 after colliding with a buffer stop at Liverpool Lime Street. The train had run away down the hill from Edge Hill whilst returning with brake problems. The train was running without passengers at the time and the driver and guard both survived the accident without serious lasting injury. The platforms were evacuated in time before the train struck the buffers. The most serious accident involving a Class 142 was at Winsford in 1999. The driver of Class 142 No. 142008 operated by First North Western, running empty from to overran a red signal on the slow line and stopped in the path of the 06:15 to Virgin Trains express, hauled by a Class 87 electric locomotive, No. 87027 Wolf of Badenoch. The impact, which caused the unit to be written off, severed the Pacer's body from its frames and caused severe internal damage. 27 people were injured, 3 seriously. On 11 June 2009, a Class 142 (No. 142042) operated by Northern Rail derailed while en route from Blackpool to Liverpool. All but one of the 40 passengers on board escaped injury. An initial investigation was carried out by the Rail Accident Investigation Branch which determined that the engine mounted under the rear coach became detached and fell onto the track at a recorded speed of 57 mph, derailing the rear axle. The detachment of the engine caused extensive