The Desiro UK electric fleet of 45 x 5-car class 444 and 127 x 4-car class 450 is maintained at a purpose built facility designed and constructed by Siemens at Northam in Southampton.
Siemens is responsible for full maintenance until 2025 including preventative and corrective maintenance, overhaul, exterior carriage washing, wheel turning and heavy cleaning. Eight units can be undergoing maintenance within the shed at the site at any one time, while 20 return each week-night to the depot.
Strawberry Hill is the base for a group of specialist out-based employees who between them travel to locations such as Clapham Junction, Fratton, Farnham and Waterloo to carry out checks on the trains.
The fleet is owned by Angel Trains.