Further upriver, Marie leads the way in a thrilling scramble though a maze of overground caverns.
Visitors can pre-book assistance at London Overground stations by calling 0845-601-4867 at least 48 hours in advance.
Overground services are also affected, and Eurostar services are delayed by up to an hour.
Meanwhile, the lowest ratings for overall satisfaction was given to London Overground, at 72%.
And all of it is served by a vast network of coaches and trains, including underground, overground and lightrail.
London came to a near standstill on Monday with all buses canceled and overground and underground train services severely disrupted.
Andrew Ozanne, the project architect, said a lot of the site would be overground to reduce disruption to road users.
He would simply build an overground passageway above one side of the Ponte Vecchio, reaching from the Palazzo Pitti to the Uffizi offices.
The order, for 57 carriages, will allow TfL to operate longer trains and increase passenger capacity on the London Overground network.
Replacement buses will be supplied, and tickets will be accepted on First Great Western, Southern, London Underground and London Overground routes.
In traditional rehab for lower limbs, known as "overground" training, a patient practices repeated movements, whether on a treadmill or other equipment or in a pool.
They came for a variety of reasons, including the amount of available space, particularly in the Bermondsey railway arches that support the London Overground (five of the six are housed beneath an arch).
The Overground service linking Clapham Junction and Surrey Quays will have four trains an hour stopping at these stops, but the trains will not go in to Victoria or London Bridge.
BBC: Demonstrators 'mourn' loss of South London Line service
Passenger Focus singled out South West Trains and Chiltern for problems with punctuality, saying there had been a decline in satisfaction from 2010, but praised London Overground and Merseyrail for improvements.
The Overground now goes through 21 of London's 32 boroughs, and the orbital allows passengers to go on its different routes via Willesden Junction, Clapham Junction, Highbury and Islington and Gospel Oak stations.
The highest ratings for overall satisfaction were achieved by Grand Central (96%), First Hull Trains (95%), and Heathrow Connect (94%) while Heathrow Express, c2c, and London Overground all had 93% of passengers satisfied.
But he claimed that rescue operations of this nature are not unusual in a country where there is still more art underground than overground, and where archaeologists must battle the twin threats of rampant development and violent looting.
Seats are available on most London Underground, London Overground and Docklands Light Railway (DLR) platforms, all trains have clearly marked priority seating next to the carriage doors, and audio and visual info is provided on most trains and platforms.
But by blaming the privatisation of the overground railways for last year's train crash in Paddington, and by wilfully misinterpreting Mr Blair's scheme as a plan to privatise the Tube, Mr Livingstone has shown a cynical (and politically brilliant) willingness to pander to popular prejudices, while keeping the left on his side.
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