Appearance
Outwardly, the units were virtually identical to the earlier Class 303 units built in 1960. The interiors were also very similar, although the Class 311s had fluorescent lighting (unlike the Class 303s which were fitted with tungsten filament bulbs).
Along with the Class 303s, the wrap-around driving cab windows were replaced with flat, toughened glass in the 1970s to give better protection to drivers in the event of attacks by stone-throwing vandals.
Read more about this topic: British Rail Class 311
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