Southern rail operator says strikes will hit its costs

Industrial action likely to have cost Go-Ahead millions, as operator prepares for further 48-hour walkout next weekSouthern rail operator Go-Ahead laid bare the financial cost of crippling strike action as it issued a warning over its full-year results for the train business.The transport giant, which runs the Southern service through its Govia Thameslink Railway arm, said it would take a hit from the bitter industrial dispute as it faces surging costs and added that half-year passenger revenues