Advertisement Rail strikes: Passengers warned not to travel by train next week * By Michael Race -- Train passengers are to be told to only travel next week if it is absolutely necessary, even if rail worker strikes are called off at the last minute. -- Network Rail over pay, jobs and conditions. Disruption will be inevitable even if strikes are aborted because of how long it takes to restore a normal timetable. -- Network Rail, which owns and maintains Britain's railway infrastructure, said 50% of the railways will be shut down on strike days, regardless of whether the walkouts go ahead. -- GMT, it added. Delays and cancellations are also expected on non-strike days during the week, because trains will be in the wrong places and staff shift patterns mean it takes time for all workers to return to work. * When are the next train strikes? The RMT has staged a series of strikes since the summer involving about 40,000 rail workers employed by Network Rail and 14 train companies. Further action is planned with Network Rail workers set to strike from 18:30 on Christmas Eve until 27 December. They will then be joined by workers at the train companies for strikes on 3-4 January and 6-7 January. Businesses, particularly those in hospitality, have raised concerns over the impact of the strikes during the busy festive period, with industry experts suggesting more than £1.5bn of trade could be lost. Several meetings between unions bosses, train companies and Network Rail have so far failed to prevent strikes on the railways, which have been happening on and off for months. -- referendum, but has called for it to be rejected. As things stand, next week's strikes will go ahead. Even if they are cancelled, significant disruption now looks -- timetable. As with previous national RMT strikes, very few trains will run and some places will have none at all. A key reason is the involvement of Network Rail's signalling staff across Britain. -- But we won't know the result of that electronic referendum until Monday afternoon, the eve of the first 48-hour strike. Even if the deal was accepted (against the recommendation of the RMT), it would be too late to reinstate normal services on Tuesday. The rail industry is not the only sector facing strike action, with postal workers, bus drivers, teachers and nurses all set to walk out this month. Ambulance staff across many parts of England and Wales are also set to strike on 21 and 28 December. Workers are demanding better conditions and pay rises that match -- RMT general secretary Mick Lynch has said he regrets the inconvenience caused by the strikes but added that the government is ultimately to blame. "They are running the playbook and the strategy for the railway companies and directing what's going on," he said. How will you be affected by the rail strikes? Are your Christmas plans being disrupted? Share your experiences by emailing haveyoursay@bbc.co.uk. -- * Rail travel * RMT * Strike action Related content December train strikes: Union told not to hold country 'to ransom' The new Christmas Eve walkout threatens to hit celebrations and travel