Moquette is the durable upholstery fabric used on public transport across the world. This brightly coloured design from the late 1970s has a geometric pattern of repeating rows of orange, yellow, brown and black rectangles. When the surface stock cars on the District line were renewed, the mainly grey finishes of the old interiors were replaced by brighter designs. The new interiors were designed by Misha Black's Design Research Unit. The internal doors were painted orange and the moquette matched the colour scheme. This pattern was also used on the Metro and Titan buses, which were introduced about the same time as D78 stock.