2016–2019 United Kingdom railway strikes

Between 2016 and 2019, major industrial action in the form of periodic strikes and protests took place on the national railway network of the island of Great Britain in the United Kingdom. The dispute centred on the planned introduction of driver-only operation (DOO) by several train operating companies, transferring the operation of passenger train doors from the guard to the driver. Later strikes also included disputes over pay rates, planned redundancies and working hours. NI Railways operating Northern Ireland's rail network did not strike. Some of the disputes continued into early 2020, and were resolved by negotiations during the pandemic without further action. Driver-only operation was however proposed again during the 2022–2023 United Kingdom railway strikes, leading to subsequent disputes.

Supporters claimed that DOO will save costs and shorten journey times, although opponents claim that the scheme is unsafe to passengers as drivers may not have as good visibility of the train doors as guards, who are able to step out onto the platform. Opponents also claim that the scheme could lead to hundreds of job losses to train guards, although several train operating companies have denied this, stating that guards will be redeployed to an otherwise equivalent role on board.

The strikes started on 26 April 2016, initially on Govia Thameslink Railway's Southern trains, and have since spread to eight more rail franchises across the country. The strikes were led initially by Mick Cash, General Secretary of the National Union of Rail, Maritime and Transport Workers (RMT); the Associated Society of Locomotive Engineers and Firemen (ASLEF) joined the strikes in November 2016, followed by the Transport Salaried Staffs' Association (TSSA) in January 2018. Opposition to the strikes was led by then Prime Minister Theresa May and Secretary of State for Transport Chris Grayling, who labelled the strikes as "appalling" and "palpable nonsense".