This section covers the AC preservation period, from 2020 through to the present day. The year-by-year sub-sections cover our own history in more detail, plus other AC heritage developments outside the Group. Summaries for all pages can be found below. The sub-sections are grouped for convenience.
| 2020 | 89001 overhaul completed 89001 moved to Toton for painting 89001 returns to Barrow Hill after repainting 89001 moved to Soho depot for live testing |
| 2021 | 89001 completes live testing then low-speed movement testing at Soho depot 89001 returns to Barrow Hill |
| 2022 | Design work and parts procurement carried out for 89001's main line equipment 89001 moves to Loughborough for main line equipment installation and other works |
| 2023 | 89001 main line equipment installation continues at Loughborough |
| 2024 | 89001 main line equipment installation continues at Loughborough 89001 system testing carried out at Loughborough, including live 25 kV testing 89001 hauled to Crewe for further testing |
| 2025 | 89001 testing continued and other 'behind the scenes' activities completed. 89001 works under its own power on the main line for the first time in 25 years on the nights of 29 - 30 September and 30 September - 1 October 2025. |