The start of the renaissance of the line came in 1985, when third rail electrification was extended from Dalston Junction via Stratford to North Woolwich, and electric trains started to run through from Richmond. The service was never as popular south of Stratford as on the rest of this route, and as services were enhanced from the original frequency the extra trains were terminated at Stratford. Part of the reason for this was that only one track beyond Custom House through the Connaught Tunnel was electrified, which restricted the service that could be provided on the easternmost section.