"During the 2012 Games many of our passengers made small changes to their journeys which meant we were able to carry record numbers without the transport network feeling any busier.
"This section of the Northern Line is exceptionally busy during part of the morning and while the modernisation of the line will help to relieve crowding when complete next year this trial will look at whether we can improve the situation now.
"By making a small change to the time they travel our passengers' journeys could be faster and more comfortable."
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Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants