The strike means no service on the Piccadilly line — and no Night Tube until Saturday 29 September when another strike is due to begin.
Today’s #TubeStrike highlights he complete lack of slack in the transport system and the need for infrastructure spending by government. 1 line stops and london gridlocks. It also shows we need driverless trains!— James Robson (@Robson__James) September 27, 2018
The RMT has apologised to passengers for the disruption and say the strikes "revolve around our working conditions and management breaking our agreements."
"We are striking to be treated with dignity and respect at work."
The chaos caused by the strike also reached the UK's biggest airport, London Heathrow which is served by the Piccadilly Line.
So we have a bloody strike.!! So sick of this and this shit mayor who has no idea what he is doing. Getting to Heathrow with no information along with countless tourist is just unacceptable. #sackkhan.— Nimco Ali 🔻 (@NimkoAli) September 27, 2018
Meanwhile, the person working for the Piccadilly Line Twitter account admitted they did not know the reason for the strike while other social media users have hit out at London Mayor Sadiq Khan who promised there would be no strikes while he was mayor.
I'm sorry but I have not been briefed on the exact reason behind the strike action, it follows a dispute between the RMT union and management. Whatever the cause, I hope the issues can be resolved for the benefit of everyone, Tariq— Piccadilly line (@piccadillyline) September 26, 2018
— Purbs.beer (@andypurbrick) September 27, 2018
Tube strikes disrupting your day? Sadiq Khan promised no strikes while he was Mayor.— Cllr Mitchell Goldie (@MitchellGoldie) September 26, 2018
This is the 13th strike under his watch… pic.twitter.com/stiptlocRQ