In July 2012, it was announced by
Network Rail that the
Midland Main Line (MML) would be
electrified north of
Bedford, allowing the diesel trains currently used on the route by to be replaced with new electric trains. However, electrification was 'paused' by Network Rail in June 2015, and then cancelled in July 2017 by then-
Secretary of State for Transport,
Chris Grayling, who made the decision to use bi-mode trains on the MML instead. In August 2019,
East Midlands Railway placed a £400million order for 33 five-car bi-mode units, to replace its
Class 180 and
222 fleets on the MML. following multiple delays, the fleet was planned to enter service in early 2025, but this did not happen. In October 2020, following a public competition, EMR announced the Class 810 units would be branded as
Aurora. In June 2025, having missed the May 2025 timetable change, EMR confirmed that the units would be introduced in "a phased roll-out during 2026" to allow for completion of testing and validation during summer 2025, followed by acceptance and training of drivers and train crew. On 8 August 2025, the first unit was accepted into their fleet following the completion of testing. On 10 November 2025, EMR confirmed that the first units would enter service in time for the December 2025 timetable change, On 3 December 2025, the first train formed the 07:00 service from Sheffield to London St Pancras. ==Design==