London Wiki

The Docklands Light Railway extension to Dagenham Dock is a proposed, and as yet unfunded, extension of the Docklands Light Railway to Dagenham Dock Station in east London. It was anticipated that the project could be completed and open for use by 2017. However the public inquiry has been postponed due to concerns about funding. The proposed extension forms part of the planned transport infrastructure of the London Riverside section of the Thames Gateway redevelopment project.

Diverging from the Beckton branch at Gallions Reach Station stations would be at:

More information on the Wikipedia page [1]. A TfL pdf here and there is various other coverage.