The National Bus and Railworkers Union has served strike notice on Dublin Bus for Tuesday, February 15th. The action is being taken in pursuit of a 20 per cent pay claim. The strike will be for one day, followed by two days in the following week, Tuesday, February 22nd and Wednesday, February 23rd. It will be escalated to three days in week three of the dispute and four days in week four. An all-out strike will follow from Sunday, February 12th.