By 2001 the D Stock on the District Line was the only fleet that hadn't been painted into the London Underground red, white and blue livery. They were also the only remaining trains from the "unpainted" era that hadn't been given an interior overhaul.
So in 2001 a prototype interior scheme had been produced, given to the centre car of unit 7008 (7008-17008-8008). The colour scheme had been changed from the 70s and 80s orange to a more subtle green and grey colour.
Handrails were fitted by the doors, horizontal handrails replaced the hanging bobbles, information screens were fitted, new covers fitted to the ceiling vents, large windows cut out into the ends of cars, uncovered T12 4ft cool-white fluorescent tubes replaced with a diffuser and T8 4ft daylight-white tubes.
The production refurbishment didn't include the fitting of door handles, existing handrails and ceiling vent covers used, and T8 5ft fluorescent tubes used, and door open buttons removed. Car 17008 was left mostly in prototype interior.
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