of the Great Western Main Line up to Didcot Parkway, as well as the Reading-Taunton line as far as Newbury, services between London Paddington and Didcot Parkway, as well as between Reading and Newbury, have been operated by new Class 387 electric multiple units, allowing much of the existing Class 165 fleet to move to the Bristol area. Class 165s continue to service the aforementioned branch lines, but no longer run to London Paddington except during peak hours. Bristol area Following the transfer of the 166 units to St Philip's Marsh depot in July 2017, some of the 165 services have since followed on with the first 165 operating in the Bristol area in July 2018. Since then and alongside the 166s, they have rapidly been introduced on other services such as the Weston-super-Mare to Filton Abbey Wood (now Weston-super-Mare / Bristol Temple Meads to Severn Beach / Filton Abbey Wood)services, the Cardiff Central to Taunton services, the Golden Valley Line, the Heart of Wessex Line and also some services on the Wessex Main Line as far as Warminster and Southampton Central. In January 2019, they began operating the regional service between Cardiff Central and Portsmouth Harbour which allowed more of the Class 158 units that solely operated this service to move more west. The transfer of the 165 (and 166) units to services in and around Bristol and Exeter have overall allowed units that previously operated these services to move further west, such as the Class 150 and Class 158 units. More so than the 166 units, a lot of the 165 units remain to be based at Reading TMD where they continue to operate Thames Valley services. Fleet details Hybrid powertrain It was reported in September 2018 that Angel Trains was to convert class 165 units for Chiltern Railways to hybrid diesel and battery-powered trains. In April 2020, two-car unit 165004 was sent to LORAM rail at Derby for HyDrive conversion. References Further reading 165 165 Train-related introductions in 1991