"much more complicated ... than buying new trains", it was also "significantly cheaper", and industry observers suggested that Porterbrook also benefited significantly in that it wasn't left with the burden of having to find a new user for, or scrapping, the Class 460 fleet. The primary contract for delivering the project was awarded to Alstom, who appointed Wabtec to perform the conversion work on their behalf. In the first phase of the project, all 48 Class 460 intermediate vehicles were sent to Wabtec's Doncaster Works to be rebuilt and refitted. Various items of electrical and mechanical equipment such as compressors and traction motors were rearranged as required depending on whether the vehicle was one of the 30 to be inserted into original Class 458 units, or one of the 18 that would remain in the six Class 460 formations. At the same time, 12 of the 16 driving vehicles from the Class 460 fleet (all eight DMSOs and four of the eight DMLFOs) were rebuilt by Wabtec subsidiary Brush Traction at their workshops in Loughborough, where their original driver's cabs were replaced with newly-fabricated versions that included gangways and Voith automatic couplers of the same types used on and 450 units. The four selected DMLFO vehicles had their luggage compartments converted to additional passenger saloon space, and their roller-shutter external doors were replaced with power-operated plug doors taken from the other four DMLFO vehicles. Additional modifications included re-gearing the traction motors to reduce the train's maximum speed from to , both to reduce the likelihood of overheating when making frequent stops and starts, and because the higher speed was unnecessary on suburban services in any case. New Train Management System (TMS) software was developed to be compatible across the entire Class 458/5 fleet, simplifying maintenance and improving reliability. An Automatic Selective Door Opening (ASDO) system was installed for use at a small number of stations where it was impractical to lengthen platforms. The vehicle interiors were refurbished and reconfigured as standard-class only, with 4-abreast seating and a wider aisle throughout. The units were also repainted into SWT's blue livery, matching the Class 450 fleet. SWT expected to receive the first two converted Class 460 units in May 2013—in time for them to enter service the following November—but due to delays in production the initial delivery didn't take place until October. Following testing and staff training, entry into passenger service was