The former line was extended northwards from Whitechapel, with new stations at Shoreditch High Street, Hoxton, Haggerston and Dalston Junction using 2.2 miles (3.5 km) of new trackbed between Whitechapel and the Broad Street viaduct, and disused trackbed for most of rest of the distance.
A further extension to Highbury & Islington was opened in February 2011.

It was extended south to connect to the London Bridge arm of the Brighton Main Line, linked via a northbound flyover north of New Cross Gate.
Other than the new flyover and some associated works around New Cross Gate, it uses almost entirely existing track, running south to West Croydon via Brockley, Honor Oak Park, Forest Hill, Sydenham, Penge West, Crystal Palace (by way of a branch), Anerley and Norwood Junction.

The official opening of most of phase 1 of the East London line extension took place on 23 May 2010.
Use of the line was forecast to increase from the previous 10.4 million passengers per year to 35.4 million, and to 50 million when phase 2 is finished.
Transport for London acquired 20 new four-car Class 378 Bombardier Capitalstar electric multiple units to operate on the line.
Unlike the dual-voltage 378s on the North London and West London lines, the East London line units can only receive power from the third rail electrification, although, like all modern EMUs, they have the potential to be retro-fitted.

The track and the northern extension remain under TfL ownership, and the stations from Dalston Junction to Surrey Quays are part of the London Overground network.
The extension runs northwards from Whitechapel to Dalston Junction, and south to Crystal Palace and West Croydon.
The former line was extended northwards from Whitechapel, with new stations at Shoreditch High Street, Hoxton, Haggerston and Dalston Junction using 2.2 miles (3.5 km) of new trackbed between Whitechapel and the Broad Street viaduct, and disused trackbed for most of rest of the distance. A further extension to Highbury & Islington was opened in February 2011.
It was extended south to connect to the London Bridge arm of the Brighton Main Line, linked via a northbound flyover north of New Cross Gate. Other than the new flyover and some associated works around New Cross Gate, it uses almost entirely existing track, running south to West Croydon via Brockley, Honor Oak Park, Forest Hill, Sydenham, Penge West, Crystal Palace (by way of a branch), Anerley and Norwood Junction.
The official opening of most of phase 1 of the East London line extension took place on 23 May 2010. Use of the line was forecast to increase from the previous 10.4 million passengers per year to 35.4 million, and to 50 million when phase 2 is finished. Transport for London acquired 20 new four-car Class 378 Bombardier Capitalstar electric multiple units to operate on the line. Unlike the dual-voltage 378s on the North London and West London lines, the East London line units can only receive power from the third rail electrification, although, like all modern EMUs, they have the potential to be retro-fitted.
The track and the northern extension remain under TfL ownership, and the stations from Dalston Junction to Surrey Quays are part of the London Overground network. The extension runs northwards from Whitechapel to Dalston Junction, and south to Crystal Palace and West Croydon.
East London line