London Underground and two rail contractors have been fined £100,000 each after a tube maintenance wagon was allowed to run out of control.
The wagon reached speeds of up to 30 miles per hour as it travelled through seven stations on the Northern Line in August 2010.
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A minute's silence is being observed at midday around Britain to remember the victims of the van attack near Finsbury Park Mosque last week.
Drivers of diesel cars are being hit with an extra £2.45 charge to park in parts of central London.
An inquest is due to open into the deaths of five friends who drowned during a day trip to Camber Sands in East Sussex last summer.