Maintenance and stabling facilities are being extended to handle a new fleet of DLR trains.
The works are being split into several contracts.
Buckingham has been confirmed as the contractor to deliver the Northern Siding package, worth £35m.
Works involve building a new carriage wash, extension and modification to existing track, and the creation and modification of new stabling sidings.
The largest project worth up to £45m is still out to tender and involves the design, and fit out of the new maintenance facility and track connections.
This will be built adjacent to the Northern Sidings and is one of the final packages to be delivered.