Disruptive London Tube strike

A 24-hour strike hit London's well-known subway system, the London Underground, called the Tube, leaving millions of commuters with a chaotic morning trip on Thursday, July 9, 2015.

The strike, which is over pay and work schedules due to take effect when some of the Tube's lines begin 24-hour service later in the year, started Wednesday evening, July 8.

The new "Night Tube" service is scheduled to start operation in September. Current service begins around 5:30 a.m. and the system shuts down between midnight and 1 a.m.

Here, pedestrians walk across Waterloo Bridge backdropped by the Houses of Parliament during the morning rush hour in London, July 9, 2015.

London Tube strike

The Underground, which first began in 1863 - 152 years ago - as The Metropolitan Railway, now delivers 4 million journeys a day.

Commuters were forced to find alternate means of transport such as bus, taxi, or bicycle or were left to make their journey on foot.

In this photo, early morning commuters form queues to board buses at Victoria station during the Tube strike in London on July 9, 2015.

London Tube strike

During a 24-hour London Underground strike, workers from an outside agency give people travel advice by the closed entrance doors of Waterloo Underground station in London, on July 9, 2015.

The strike was the London Underground's first strike shutdown since 2002.

London Tube strike

Commuters cross the river Thames using the Millennium footbridge during the Tube strike in London, on July 9, 2015.

There are 270 stations in the Tube system and 250 miles of track.

London Tube strike

Commuters queue for buses during the 24-hour Tube strike in London, on July 9, 2015.

London Tube strike

Commuters make their way towards Waterloo Bridge in London on July 9, 2015.

London Tube strike

Commuters wait on board a bus at Waterloo Station in London during the 24-hour Tube strike, July 9, 2015.

London Tube strike

During a 24-hour London Underground strike, pedestrians walk across Waterloo Bridge, backdropped by St. Paul's Cathedral, during the morning rush hour in London on July 9, 2015.

London Tube strike

Commuters depart Waterloo Station in London on July 9, 2015.

London Tube strike

Commuters emerge from Victoria Station, London on July 9, 2015.

London Tube strike

Early morning commuters squeeze onto a bus in the City during a Tube strike in London on July 9, 2015.

London Tube strike

Commuters wait for buses at Victoria Station, London during the 24-hour strike, July 9, 2015.

London Tube strike

Commuters form a long queue as they wait for buses at Victoria Station, London on July 9, 2015.

London Tube strike

A commuter rides a bike through the traffic in the City during a Tube strike in London on July 9, 2015.

London Tube strike

Union protesters stand at the locked gates of Brixton Underground station during the Tube strike in London on July 9, 2015.

London Tube strike

Commuters wait for buses at Victoria Station in London on July 9, 2015.

London Tube strike

Early morning commuters walk past a closed Underground gate at Victoria station during the Tube strike in London on July 9, 2015.

London Tube strike

During a 24-hour London Underground strike, travelers line up for buses in London on July 9, 2015.

London Tube strike

The Tube entrance gate is closed at St. James Park Station as Tube drivers strike in London, July 9, 2015.

London Tube strike

Commuters queue up for buses during the morning rush hour during the Tube strike in London, July 9, 2015.

London Tube strike

During a 24-hour London Underground strike, commuters line up to rent bicycles in London on July 9, 2015.

London Tube strike

A commuter talks to a member of staff at Victoria Station in London during the 24-hour Underground strike, July 9, 2015.