A 36-hour pay strike by electricians who maintain the Tube network after hours has ended.
The 25 staff, who are employed by EDF Energy Powerlink, went on strike at 2000 GMT on Sunday. They plan to stage a second walkout on 7 December.
The Rail, Maritime and Transport union (RMT) said night workers were seeking job parity with workers on day shifts. It said the strike was "100% solid".
Transport for London said the strike has had "no impact" on the network.
'Pay parity' demand
The electricians are responsible for finding and fixing faults on more than 250 London Underground power sub-stations and for maintaining supply.
RMT general secretary Bob Crow said night workers were seeking a £3,000 pay rise for agreeing to greater shift flexibility - an allowance that day electricians are currently receiving.
He said shift workers had changed from 10-hour days and 14-hour nights to a new system of 12-hour shifts.
Mr Crow said: "Our members have shown EDF Energy Powerlink very clearly how they feel about their claim for pay parity, and it is time for EDF to get off its high horse and talk."
Earlier a spokesman for the energy company had said it hoped to find an "amicable resolution" to the dispute.
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