The District line has a long history. It was built by the Metropolitan District Railway and opened in stages from 1868. The MDR was later bought by Charles Yerkes, forming part of the "Underground" group until it was nationalised in the 1930s.The District line is a line of the London Underground, coloured green on the Tube map.It is the busiest of the sub-surface lines and the third busiest overall on the Underground network. Out of the 60 stations served, 25 are underground.It is sometimes closed between Barking and Upminster at weekends.Most of the District line's services use sub-surface D stock, although the Wimbledon to Edgware Road service uses C stock, due to shorter platform lengths between High Street Kensington and Edgware.The D stock has been refurbished, having received the standard Underground livery of red, white and blue, replacing the previous unpainted aluminium finish which is prone to damage by graffiti vandals. The stock also received a complete interior refurbishment and was fitted with CCTV and passenger information displays. The trains are maintained at Ealing Common Depot and Upminster Depot.A D stock (unit 7115) was taken out of service to be refurbished on 15 February 2008. Its run could have extended into the weekend, but due to planned weekend engineering works it was taken out on Friday at the end of operations. It was the very last silver train on the London Underground; fittingly running on the line which first introduced unpainted train.
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