Pacer
At the start of 2020, 138 Pacer units were still being used or stored by three National Rail operators: Northern Trains, Great Western Railway and Transport for Wales. Northern Trains retired its last Pacer unit on 27 November 2020, and so did Great Western Railway in December 2020. Transport for Wales  kept using their Class 143s into the first part of 2021 until May 2021.