In the late 1970s, the Greater London Council began to revitalise the North London Line, incorporating it onto the Tube Map in 1977 as a white line with black borders marked "British Rail" and electrifying the route from Dalston to Woolwich in 1985. The limited Clapham Junction - Kensington Olympia service appeared in the public timetables, but full passenger services on the West London line were not re-introduced until 1994 by Network SouthEast service. In 1997, as part of the privatisation of British Rail, operation of both the WLL and NLL was brought under the North London Railway franchise, and taken over by National Express, trading as Silverlink. For a decade, the West London line was operated with the green-and-purple liveried Silverlink Metro trains.