Before revision: In this example of retrofitting (interior view on left, exterior on right), a set of modern door opening buttons has been retrofitted to this British Rail Class 483 electric multiple unit, which was derived from 1938 tube stock.
After revision: In this example of retrofitting (interior view on left, exterior on right), a set of modern doors opening buttons has been retrofitted to this British Rail Class 483 electric multiple unit, which was derived from 1938 tube stock.