Tube engineering work in central London has been halted this weekend with all lines open to help shoppers and retailers travel around during the busy pre-Christmas period.
Shops and department stores are looking to this weekend for a major boost in sales and provide desperately need relief from the recession.
The Docklands Light Railway, London Overground and London Tramlink will also operate a full service free from engineering shutdowns.
Only the Northern line will have some slight disruption first thing Sunday morning; services between Camden Town and Edgware won't start until 8.30 am southbound and 9 am northbound.
The move came as talks continued to try and avert a threatened strike on Boxing Day by train drivers belonging to the Aslef union in a dispute over pay and working bank holidays.
The result of a ballot among more than half the Tube's 3,200 drivers is due this coming Monday with the union forecasting overwhelming support for the strike call.
Union bosses have already earmarked Boxing Day for the walkout - it will be the third successive year the same dispute has caused major disruption across the network.
It will hit both the first day of the post Christmas sales and families making traditional visits.
The dispute dates back to a 1992 agreement which saw staff getting higher salaries and increased annual leave in return for working "some" days off.
Aslef says the situation has changed since then and its members are now working all or most bank holidays.
Drivers belonging to the rival RMT union are not involved in the dispute.
Howard Collins, London Underground (LU) chief operating officer, said: "LU has a long standing agreement with all trade unions which cover working arrangements on bank holidays, including Boxing Day.
"Further action will not achieve anything."
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Aslef drivers have voted for action short of a strike - which includes an old fashioned work to rule - regarding working conditions on the Metropolitan line.
This is in protest over what the union says are defects which include the ventilation system - making the drivers' cab "too hot" - and a radio system which is "too loud."
Ongoing action will begin next Wednesday and could result in a shortage of trains.
Nigel Holness, LU operations director, said he was "surprised" by the industrial action.
He said: "LU takes the welfare of its staff very seriously and regularly meets with staff representatives to listen and respond to any concerns over their working environment.
"We have been working closely with the Aslef leadership to resolve these issues raised by drivers on the Metropolitan line and believe that we have either addressed each issue or have put in place speciific plans to deliver the necessary improvements."
