  
    Built:
    1971/72 BR Works Holgate York.  Ordered to Replace 1930s 4 COR units on the Waterloo Reading Line
  
    Withdrawn:
    SWT 2005 as mainline 4 coach Unit, SWT 2020 as Lymington Heritage Unit 3 coach Unit
  
    Owner:
    19947 Group
  
    Type:
    4 CIG Class 421/2 Phase 11
  
    Motors:
    4 English Electric 507  250hp each, 1,000hp per unit
Aux Generator English Electric Type 906/1B 6-pole, rated @ 13.3 Kw 147 Amps @ 90 Volts
  
    Configuration:
    DTC - MBS - TS (now removed) - DTC
  
    Heating:
    Electric Train Heat from Electric Third Rail Only
  
    Max speed:
    90 mph
  
    Livery:
    British Rail Blue, Network South East, British Rail Blue
  
    Status:
    Serviceable but as of 2026 undergoing window, laminate and vinyl flooring repairs
  
    Notes:
    Some of the last BR Mk1 coaches built for the Southern Region of BR at a time Mk3s were being ordered for elsewhere on BR.  Unit Number History 7414, 1214, 1883, 1497.  Unit can be driven from the front, controlling 73140 at the rear via the 27 way Southern Region Jumpers.  Guards Compartment was converted into use for Disabled Wheelchair with Emergency Call and Light system. Unit has had several Double Glazed Windows replaced and new Upholstery