Pictures from West Ham station this morning show crowds of people waiting to board the Tube.
There were similar scenes in Canning Town last week. Transport for London said staff absences caused cancellations and delays, and it was not representative of the rest of the Network.
At the weekend, Transport Secretary Grant Shapps urged construction companies to stagger start times to prevent overcrowding.
The second lockdown may have cut the number of people travelling on the Tube at the moment but those who go through Oxford Circus may have noticed London Underground's famous roundels are now new shapes.
The signs at the central London station have been changed to look like icons on PlayStation controllers to mark the release of the firm's new console.
By Thomas Mackintosh
BBC News, London
By Patrick Cowling
Freedom of Information researcher