Londoners face more travel chaos as disruption caused by Tube strikes enters its fourth day on Friday.
A 24-hour strike on Tuesday was followed by another which started at midday on Thursday which will run to Friday at 12pm.
London Underground has been hit with delays and suspensions by the two strikes throughout the week.
Tube drivers who are members of the Rail, Maritime and Transport (RMT) union are striking in a dispute with Transport for London (TfL) over changes to the working week.
Every Tube line was either experiencing severe delays or suspended on Thursday evening and trains will not start running until 7.30am on Friday.
Delays are expected to continue after the strike ends at 12pm and services will not return to normal until at least the evening.
London Underground bosses have urge the RMT to call off the strike and meet for talks.
More 24-hour strikes are planned in May and June unless the row is resolved.
Picket lines were again mounted outside Tube stations from noon on Thursday.
Pubs and restaurants fear losing trade this week because of the industrial action as fewer workers than normal have travelled to offices.
Earlier in the week, TfL called on the RMT to call off the strikes and come to the negotiating table.
Nick Dent, Director of Customer Operations for London Underground said: “We urge the RMT to call off this strike... we expect significant disruption to continue into Friday and the level of service we can provide will vary across lines, so customers should continue to check before they travel for the remainder of this week.
“We have set out proposals to the RMT for a four-day working week which are supported by the other Trade Union representing London Underground drivers. This allows us to offer train operators an additional day off, whilst at the same time bringing London Underground in line with the working patterns of other train operating companies, improving reliability and flexibility at no additional cost.
“The changes would be voluntary, there would be no reduction in contractual hours and those who wish to continue a five-day working week pattern would be able to do so.”
RMT official Jared Wood said union members felt strongly about the issues at the heart of the dispute.
He said the row was not just about a four-day week and that other issues were involved such as the length of shifts and changes to annual leave.
He said: “TfL need to come forward with changes to their proposals for this dispute to be resolved.
“There is absolute unanimity among our members that we have to fight these proposals.”
