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.