Union leaders have warned they could strike again next week

Seven lines were running with minor disruptions but the Circle, Hammersmith & City and East London lines remained suspended, said an LU spokesman.

District and Metropolitan lines services have been partly restored.

More than 2,000 staff had walked out on Monday in a dispute linked to the collapse of maintenance firm Metronet.

However, nine hours of talks with managers on Tuesday finally led the Rail, Maritime and Transport (RMT) to halt the strike.

Returning to normal

Transport for London (TfL) warned services would remain disrupted.

A TfL spokesman said staff were working to restore the network, which involved checking tracks, points and signalling equipment.

He said: "I wouldn't like to speculate when a full service will be restored, other than to say that the process is taking place."

TfL commissioner Peter Hendy said: "At some stage during the day we will get everything running.

LATEST TRAVEL UPDATES Bakerloo: Reopened Central: Minor delays Victoria: Normal services Piccadilly: Normal services Waterloo & City: No problems Circle: Suspended District: Partly suspended East London: Suspended Jubilee: Normal service Metropolitan: Partly suspended Northern: Normal service Hammersmith & City: No service Latest TfL travel news

"Some things we hope will start fairly soon but the suspension came so late last night that it will be impossible to start normally."

TfL said it had clarified assurances on jobs and pensions during Tuesday's talks.

Asked if anything new had been offered during the talks, Mr Hendy said: "There isn't anything fresh in terms of 'meat' to give them.

"They had... all of the assurances on Thursday and Friday."

RMT general secretary Bob Crow said they now had the assurances, they had been seeking, in writing from the employer.

He said the full pension scheme rescue was expected to be in place by Thursday.

"This means that our members will now actually have their pensions restored to them, which is rather different than promises from a man in an expensive suit," he said.

"We also now have written commitments that any subsequent proposals will be subject to proper discussions through the existing negotiating machinery."

'Wholly unjustified'

Mr Crow also praised his members for their "rock solid" strike despite "enormous pressure and hostile media".

The union will meet again on Friday before deciding whether to continue with a second 72-hour strike on Monday.

The strike closed two-thirds of the Tube network causing travel chaos for millions of passengers.