was re-branded North Western Trains, and it inherited 17 of these units (323223–323239). North Western Trains became First North Western in 1998 and its operations were taken over by Northern Rail in 2004. All passed to Arriva Rail North with the franchise in April 2016, and then to current operator Northern Trains on 1 March 2020. The fleet is currently maintained at Allerton TMD, with units terminating in Manchester stabled at Stockport Edgeley carriage sidings where they receive overnight cleaning as well as Ardwick TMD operated by Siemens, where they are washed alongside the Class 185 TransPennine Express fleet. The 323s were formerly maintained at Longsight Electric TMD. In the future the fleet will be stabled and maintained at Manchester International Depot. Accidents and incidents On 18 December 2008, unit 323231 collided with a Nissan 4x4 which had rolled down the embankment from a delivery company car park at North Rode, Congleton. The unit spent 16 months out of service to undergo repair as a result. On 17 December 2019, unit 323234 derailed in the Ardwick train depot. The train rolled approximately 4 feet away from the railhead and where it had ended up. No one was hurt in the accident as it occurred at a low speed. Future The 323s were expected to leave Arriva Rail North in December 2018 when replaced by the ; however, this did not take effect. The Northern Trains 323 fleet will be retained, replacing the older s, and being joined by 17 units cascaded from West Midlands Trains. Class 323s operated by both Northern Trains and West Midlands Trains received a full refurbishment between 2018 and 2021, with the first refurbished units delivered to West Midlands Trains in February 2019, and the first Arriva Rail North unit (323234) returning on 22 October 2019. The rest of fleet was refurbished to the same standard over the following years. These works involved the replacement of seat covers, interior and exterior repainting (into the new livery of their respective operators), the installation of a new passenger information system and wheelchair call-for-aid buttons, and the addition of an accessible toilet in place of the original small toilet cubicles, among other modifications. The last Class 323 unit to be refurbished (323224) returned to Northern Trains on 23 January 2021, while the last West Midlands Trains 323 unit (323226) was returned in 2020. Many of these changes were a