NO services are running on the Docklands Light Railway (DLR) because of a 48-hour strike called by the Rail, Maritime and Transport (RMT) union.
Union members walked out at 04:00 GMT in a row over working practices, including the use of agency staff.
RMT general secretary Mick Cash accused management of "sheer intransigence" but
DLR operator Keolis Amey said the strike was "extremely disappointing".
Transport for London said extra buses would run during the industrial action.
But it warned the Jubilee, District, Central and Hammersmith and City lines would be busier than normal.
