Millions of commuters in London faced long delays and disruption today as a 48-hour strike over Tube ticket office closures hit services.
Members of the Rail Maritime and Transport Union (RMT) and the Transport Salaried Staffs' Association (TSSA) walked out at 9pm last night in protest at the closure of all ticket offices, with the loss of 950 jobs.
There was an immediate impact on services but disruption is expected to be widespread during the rush hour later today and tomorrow as millions of commuters attempt to journey around London.
Around three and a half million trips are made each day on the London Underground's eleven lines.
London Underground said it was operating train services on eight of their lines despite what they described as the "completely unnecessary" strike.
However, services were crippled by the strike straight away this morning with Oxford Circus tube station opening at 7am and closing just eleven minutes later due to a lack of staff. It later reopened.
In pictures: Tube strike in London (February 2014)
In pictures: Tube strike in London (February 2014)
1/19 London Bridge station
Mayor of London Boris Johnson leaves London Bridge station
2/19 London Bridge station
Mayor of London Boris Johnson shakes hands with a 'Tube Ambassador' at London Bridge station
3/19 Trafalgar Square
A congested Trafalgar Square during rush hour
4/19 Victoria station
Passengers wait on the east bound platform of the District Line at Victoria station
5/19 Farringdon station
Commuters boarding a train at Farringdon Underground station
6/19 King's Cross station
Commuters waiting at a bus stop at King's Cross station during the London Underground workers strike
7/19 Tube strike
A out of service tube train at an underground station in London
8/19 Tube Strike
A tube strike notice as commuters face a 48 hour tube strike
9/19 Euston station
Commuters attempt to board the overcrowded train
10/19 Liverpool Street station
Crowds gather at the platform
11/19 Victoria station
Victoria line runs only between Seven Sisters and Victoria station
12/19 Victoria station
Commuters board a tube train
13/19 Victoria station
Commuters wait for a tube train
14/19 Waterloo station
Passengers were hit by delays and disruption as they tried to get to work or travel in London after a strike went ahead over Tube ticket office closures
15/19 Waterloo station
Commuters queue at the entrance to the London Underground
16/19 Seven Sisters station
Gates still closed at Seven Sisters at 7.20am despite service due to start at 7am (tube was open and running by 7.30am)
17/19 Earls Court station
Overcrowded platform on the District line
18/19 Stratford station
Extreme chaos as crowds try to board the train on the Jubilee line
19/19 Tooting Broadway
A queue to the station on the Northern line
Elsewhere, Victoria Station remained closed earlier despite a notice saying that a limited service would begin at 7am - it also later reopened.
Images emerged on social media of large queues building outside some stations.
The strike has also had a knock-on impact on services elsewhere with reports of London Overground trains being so crowded that passengers were unable to board them at stations in north-west London.
As expected queues formed at bus stations across the capital.
RMT leader Bob Crow said: "As we expected the action is rock solid this morning and has reduced the network to a skeleton service with only a few ghost trains running through closed stations.
"That is simply a reflection of the staff anger at attempts to bulldoze through cuts to jobs, services and safety which would reduce the Tube to a dangerous, hollowed-out shell", Mr Crow told BBC London 94.9.
"We're available today and later tomorrow for talks and we want to resolve this. The mayor should do the honourable thing and meet with us."
"We respect the mayor. We may disagree with him," he continued. "But all we want to do is to listen to our point of view."
TSSA leaders claimed the service had been reduced by 70% and called on Boris Johnson to "end government by gimmick" and "enter serious talks".
Train passengers were also having problems because of a return to the wet and windy weather which has devastated travel across the UK.
Southeastern trains said the forecast weather, after the wettest January for a century, presented a risk of further flooding, landslips and falling trees.
Network Rail has put in place a 40mph speed restriction across parts of the Southeastern network.
Meanwhile, politicians have condemned the industrial action, with Conservatives again calling for changes to employment laws covering the numbers voting for strikes in a ballot.
Yesterday, a spokesman for the Prime Minister said Mr Cameron "thinks that Bob Crow's strike is plain wrong and he should call it off rather than inflict misery on hard-working families in London".
Boris Johnson responded to the disruption caused by the strikes saying: "We are doing all we can to try and get people to work."
"I recognise in some cases it is difficult, and I feel enormous sympathy for Londoners this morning, but the blame for this strike lies squarely with union leaders who have resorted to myths and stunts in a pathetic attempt to justify a strike that is utterly pointless."
"It's appalling that a tiny minority of union members have sought to disrupt the working lives of millions of Londoners today. It's clear that at a minimum we need a 50% strike threshold for a key public service like the mass transit system of our capital city."
Earlier this week, Mr Johnson accused rail union boss Bob Crow of holding London to ransom ahead of the two strikes.
His comments came after photographs appeared in the press showing Mr Crow sunbathing on a beach in South America.
In his weekly column for the Daily Telegraph, the mayor said that while he did not begrudge Mr Crow his holiday, he was not entitled to "disrupt the lives of millions of people who are not on holiday but who want to work".
Mr Crow hit back, however, and stressed that his holiday was "booked up well before" the strike action. Mr Crow was also questioned about whether his high-profile was a distraction and how much the holiday cost, with some claiming it was £10,000.
"If I'm going to spend £10,000 on a car, or if I'm going to spend £10,000 on a holiday, or £10,000 on cigarettes, that's up to me," said Crow.
"I'm not being a distraction at all. What do you want me to do? Sit under a tree and read books of Karl Marx every day?" he added.
Watch a video from the picket line last night