Demand is expected to be particularly heavy from Wednesday, when the public can attend the lying-in-state at Westminster Hall from 5pm.
Transport bosses have said they expect demand on railways and roads in London to be "unprecedented" as people travel to pay respects to the Queen.
The group has urged passengers to leave plenty of time for travel during the official mourning period, which ends the day of the Queen's state funeral on Monday 19 September. Network Rail said a normal timetable would be running on the day of the funeral, rather than a reduced one that might operate on a regular bank holiday.
People have been told to avoid Green Park tube station if possible, and use others such as Victoria, Piccadilly Circus and St James' Park.The Elizabeth Line does not usually operate any services on a Sunday on the central section between Paddington and Abbey Wood, but this Sunday it will operate 12 trains an hour.
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