 From the 1980s onward, only one track of the double track line was used through the Connaught Tunnel under the Royal Docks and on to North Woolwich, where the station building and a platform were closed and replaced by a minimalist entrance and passenger shelter on the south side.In 1985 the line from North Woolwich was electrified on the third rail system under British Rail, with the service running round inner north London to (a route part-third rail and part-overhead wire).Prior to closure, the typical service frequency Monday to Saturday was every 30 minutes during the daytime, increasing to every 20 minutes in the evening and every 30 minutes all day Sunday.