Refurbishment
In the early 1980s, a refurbishment programme was carried out on the units. This included the removal and scrapping of the Trailer Composite vehicles, reducing the units to three-car formation, and the conversion of the Motor Brake vehicles of the first batch (Class 304/1) to saloon layout, reducing seating capacity to 72. Unlike other EMU refurbishment programmes, the work carried out on Class 304 units did not include the fitting of inter-vehicle gangways, or the complete replacement of internal fittings. This meant that original 1960s seats and trim remained in most vehicles, retaining something of their original character. The units were also repainted into blue and grey livery. The loss of one vehicle meant that the power-to-weight ratio of the units increased, thereby improving their performance.
Read more about this topic: British Rail Class 304