For me, the verb 'to sort' is to arrange items in some kind of pattern, not to deal with something, that would be 'to sort it out'. Once I have arranged the said items, they would be 'sorted'; something dealt with would be 'I've sorted that out'. This use of 'to sort' and 'sorted' to mean the latter is, so far as I can tell, something copied from telly crime dramas, where some East End heavy grunts 'sor'id' after having fulfilled his task of burying a corpse or the like. Why it's used as a slogan, and one that is seemingly broadcast over the train's tannoy after every stop, is beyond me. It's been used for far too long, and either needs to be replaced by something less grating, or -- better -- not replaced at all, thereby helping to give passengers a more relaxing journey.