female announcements are still in use by two Metrocars, however can only be heard when the Metrocar is at the front of the train. Refurbishment All 90 units underwent a half life refurbishment between 1996 and 2000. In June 2010, Wabtec Rail was awarded a contract to perform a three-quarter life refurbishment at Doncaster Works, which included making them compliant with the Disability Discrimination Act 1995. The first was completed in February 2012, with the last in July 2015. Cost overruns and technical issues resulted in only 86 being completed, with 4001, 4002, 4040 and 4083 remaining in service in un-refurbished condition. Because they did not comply with the Disability Discrimination Act 1995, they were restricted to operating peak hour services. The refurbishment saw the trains undergo corrosion correction work, to repair damage as a result of the trains' steel and aluminium construction, new seating, flooring and interior finish, in addition to improved saloon and emergency lighting. A new larger wheelchair space has also been created at the end of each car, featuring a "call for assistance" device. Other minor modifications include improved door seals, more concise interior signage and removal of the green boarding lamps to facilitate new audio warning equipment for door operation. Some Metrocars also featured air conditioning boxes at their A end to control the conditions within the drivers cab, these were later removed from the units due to overhead line (OHLE) clearance issues if trains were to be placed on wheelskates. Passenger counters were integrated above doors to help Nexus analyse trends in passenger levels. These features were removed from the specification midway through the refurbishment however. After an accident at Gosforth in March 2017, 4022 was taken to Bristol Barton Hill TMD for assessment, before moving to the Nemesis Rail facility at Burton upon Trent in October 2019 for scrapping. In early 2020, units 4001, 4002, 4040 and 4083 had a luggage bay in the middle of the carriage converted to a disabled bay, making it in a different area than the refurbished units but now complying with the Disability Discrimination Act 1995. These units are still most commonly sighted on peak services but can also be seen across the network again usually as back up trains but give the Metro more flexibility with the common breakdowns of its ageing 40-year old fleet of trains. Replacement In January 2020. Stadler Rail was awarded a