Units are numbered 442401–424 and are formed of two outer driving trailers, two intermediate trailers, and an intermediate motor vehicle.
In accordance with Southern Region practice, the units only carried the last four digits of their unit numbers when in service with South West Trains.
Once refurbished for Southern Railway, and subsequently South Western Railway, the units carry the full six digits.

Individual vehicles are numbered as follows:
77382–77405 - DTS - Driving Trailer Standard (formerly DTFo (Driving Trailer First Semi-open) )
71818–71841 - TSO - Trailer Standard Open
62937–62960 - MLC - Motor Luggage Composite (formerly MBLS (Motor Buffet Lounge Standard) )
71842–71865 - TSW - Trailer Standard Wheelchair
77406–77429 - DTS - Driving Trailer Standard
The motor buffet vehicles were all modernised in a works programme at Crewe Works in 1997/98.
At the same time units were repainted from their original Network SouthEast livery into South West Trains white livery.
During 2006 Angel Trains sent some units to Bombardier at Ilford, where the livery was modified to make it DDA compliant; however, not all trains were modified as it was later announced that the trains were to be withdrawn from service.
In 2008, units started to go to Wolverton Works for refurbishment.
The refurbishment included the removal of the buffet from the motor coach, all new seats, and the removal of first class from the front of the train to the motor coach.

The description of this formation is DTS+TSO+MLC+TSW+DTS.

During the years of Network SouthEast and South West Trains, various units have received names.
Most of these were towns or places along the routes that they worked, but a few were for publicity purposes.
When the South West Trains lease expired all nameplates were removed.

The complete fleet list is shown below, with details of vehicle numbers, former names and livery.
Units are numbered 442401–424 and are formed of two outer driving trailers, two intermediate trailers, and an intermediate motor vehicle. In accordance with Southern Region practice, the units only carried the last four digits of their unit numbers when in service with South West Trains. Once refurbished for Southern Railway, and subsequently South Western Railway, the units carry the full six digits.
Individual vehicles are numbered as follows:
77382–77405 - DTS - Driving Trailer Standard (formerly DTFo (Driving Trailer First Semi-open) )
71818–71841 - TSO - Trailer Standard Open
62937–62960 - MLC - Motor Luggage Composite (formerly MBLS (Motor Buffet Lounge Standard) )
71842–71865 - TSW - Trailer Standard Wheelchair
77406–77429 - DTS - Driving Trailer Standard
The motor buffet vehicles were all modernised in a works programme at Crewe Works in 1997/98. At the same time units were repainted from their original Network SouthEast livery into South West Trains white livery. During 2006 Angel Trains sent some units to Bombardier at Ilford, where the livery was modified to make it DDA compliant; however, not all trains were modified as it was later announced that the trains were to be withdrawn from service. In 2008, units started to go to Wolverton Works for refurbishment. The refurbishment included the removal of the buffet from the motor coach, all new seats, and the removal of first class from the front of the train to the motor coach. 
The description of this formation is DTS+TSO+MLC+TSW+DTS.
During the years of Network SouthEast and South West Trains, various units have received names. Most of these were towns or places along the routes that they worked, but a few were for publicity purposes. When the South West Trains lease expired all nameplates were removed.
The complete fleet list is shown below, with details of vehicle numbers, former names and livery.
British Rail Class 442