[1] Road access to the site is off Armada Way, south of the Gallions Reach Shopping Park.

[3] To facilitate this, the depot was extended and upgraded in 2005 and 2006, with additional sidings for 36 new trains and improved signalling.

The first phase provides space for additional trains, as well as modify the existing maintenance building to allow for easier servicing of the new rolling stock.

[7] Buckingham Group was awarded the £35m contract for the first phase in 2021, commissioned to construct a new carriage wash, extension and modification to existing track, and new sidings for the new trains.

TfL appointed Morgan Sindall to complete the work, alongside their £90m deal for the second phase, to build a new train shed and deliver further sidings.